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Finding the Fourth Proportional to 399,658.32, 550,991.16 and 387,275.04

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Solution

The fourth proportional to 399,658.32, 550,991.16 and 387,275.04 is: 533,918.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,658.32 : 550,991.16 = 387,275.04 : x
  2. Step 2: Convert to fraction form
    399,658.32/550,991.16 = 387,275.04/x
  3. Step 3: Cross multiply
    399,658.32x = 550,991.16 × 387,275.04
  4. Step 4: Simplify right side
    399,658.32x = 213,385,123,528.65
  5. Step 5: Solve for x
    x = 213,385,123,528.65/399,658.32
  6. Step 6: Final answer
    x = 533,918.88

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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.