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Finding the Fourth Proportional to 645,715.88, 891,099.84 and 359,262.68

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Solution

The fourth proportional to 645,715.88, 891,099.84 and 359,262.68 is: 495,789.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,715.88 : 891,099.84 = 359,262.68 : x
  2. Step 2: Convert to fraction form
    645,715.88/891,099.84 = 359,262.68/x
  3. Step 3: Cross multiply
    645,715.88x = 891,099.84 × 359,262.68
  4. Step 4: Simplify right side
    645,715.88x = 320,138,916,665.97
  5. Step 5: Solve for x
    x = 320,138,916,665.97/645,715.88
  6. Step 6: Final answer
    x = 495,789.13

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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.