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Finding the Fourth Proportional to 1,584.40, 2,186.47 and 885.78

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Solution

The fourth proportional to 1,584.40, 2,186.47 and 885.78 is: 1,222.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,584.40 : 2,186.47 = 885.78 : x
  2. Step 2: Convert to fraction form
    1,584.40/2,186.47 = 885.78/x
  3. Step 3: Cross multiply
    1,584.40x = 2,186.47 × 885.78
  4. Step 4: Simplify right side
    1,584.40x = 1,936,731.40
  5. Step 5: Solve for x
    x = 1,936,731.40/1,584.40
  6. Step 6: Final answer
    x = 1,222.38

Related Problems

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Half scale
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Double scale
Find fourth proportional to 1,585.40, 2,187.85 and 886.78
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.