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Finding the Fourth Proportional to 924.39, 1,387.05 and 430.59

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Solution

The fourth proportional to 924.39, 1,387.05 and 430.59 is: 646.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    924.39 : 1,387.05 = 430.59 : x
  2. Step 2: Convert to fraction form
    924.39/1,387.05 = 430.59/x
  3. Step 3: Cross multiply
    924.39x = 1,387.05 × 430.59
  4. Step 4: Simplify right side
    924.39x = 597,249.86
  5. Step 5: Solve for x
    x = 597,249.86/924.39
  6. Step 6: Final answer
    x = 646.10

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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.