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Finding the Fourth Proportional to 2,591.49, 3,887.23 and 643.69

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Solution

The fourth proportional to 2,591.49, 3,887.23 and 643.69 is: 965.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,591.49 : 3,887.23 = 643.69 : x
  2. Step 2: Convert to fraction form
    2,591.49/3,887.23 = 643.69/x
  3. Step 3: Cross multiply
    2,591.49x = 3,887.23 × 643.69
  4. Step 4: Simplify right side
    2,591.49x = 2,502,176.74
  5. Step 5: Solve for x
    x = 2,502,176.74/2,591.49
  6. Step 6: Final answer
    x = 965.54

Related Problems

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.