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Finding the Fourth Proportional to 924.71, 1,387.26 and 438.30

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Solution

The fourth proportional to 924.71, 1,387.26 and 438.30 is: 657.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    924.71 : 1,387.26 = 438.30 : x
  2. Step 2: Convert to fraction form
    924.71/1,387.26 = 438.30/x
  3. Step 3: Cross multiply
    924.71x = 1,387.26 × 438.30
  4. Step 4: Simplify right side
    924.71x = 608,036.06
  5. Step 5: Solve for x
    x = 608,036.06/924.71
  6. Step 6: Final answer
    x = 657.55

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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.