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Finding the Fourth Proportional to 925.37, 1,387.41 and 431.25

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Solution

The fourth proportional to 925.37, 1,387.41 and 431.25 is: 646.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.37 : 1,387.41 = 431.25 : x
  2. Step 2: Convert to fraction form
    925.37/1,387.41 = 431.25/x
  3. Step 3: Cross multiply
    925.37x = 1,387.41 × 431.25
  4. Step 4: Simplify right side
    925.37x = 598,316.17
  5. Step 5: Solve for x
    x = 598,316.17/925.37
  6. Step 6: Final answer
    x = 646.57

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Double scale
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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.