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Finding the Fourth Proportional to 645,915.05, 891,329.63 and 493,060.15

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Solution

The fourth proportional to 645,915.05, 891,329.63 and 493,060.15 is: 680,397.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,915.05 : 891,329.63 = 493,060.15 : x
  2. Step 2: Convert to fraction form
    645,915.05/891,329.63 = 493,060.15/x
  3. Step 3: Cross multiply
    645,915.05x = 891,329.63 × 493,060.15
  4. Step 4: Simplify right side
    645,915.05x = 439,479,121,067.25
  5. Step 5: Solve for x
    x = 439,479,121,067.25/645,915.05
  6. Step 6: Final answer
    x = 680,397.71

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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.