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Finding the Fourth Proportional to 645,272.42, 890,470.42 and 358,790

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Solution

The fourth proportional to 645,272.42, 890,470.42 and 358,790 is: 495,127.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,272.42 : 890,470.42 = 358,790 : x
  2. Step 2: Convert to fraction form
    645,272.42/890,470.42 = 358,790/x
  3. Step 3: Cross multiply
    645,272.42x = 890,470.42 × 358,790
  4. Step 4: Simplify right side
    645,272.42x = 319,491,881,991.80
  5. Step 5: Solve for x
    x = 319,491,881,991.80/645,272.42
  6. Step 6: Final answer
    x = 495,127.13

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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.