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Finding the Fourth Proportional to 885.78, 1,222.74 and 637.20

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Solution

The fourth proportional to 885.78, 1,222.74 and 637.20 is: 879.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.78 : 1,222.74 = 637.20 : x
  2. Step 2: Convert to fraction form
    885.78/1,222.74 = 637.20/x
  3. Step 3: Cross multiply
    885.78x = 1,222.74 × 637.20
  4. Step 4: Simplify right side
    885.78x = 779,129.93
  5. Step 5: Solve for x
    x = 779,129.93/885.78
  6. Step 6: Final answer
    x = 879.60

Related Problems

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Half scale
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Double scale
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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.