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Finding the Fourth Proportional to 678,851.92, 936,984 and 392,330.62

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Solution

The fourth proportional to 678,851.92, 936,984 and 392,330.62 is: 541,513.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,851.92 : 936,984 = 392,330.62 : x
  2. Step 2: Convert to fraction form
    678,851.92/936,984 = 392,330.62/x
  3. Step 3: Cross multiply
    678,851.92x = 936,984 × 392,330.62
  4. Step 4: Simplify right side
    678,851.92x = 367,607,513,650.08
  5. Step 5: Solve for x
    x = 367,607,513,650.08/678,851.92
  6. Step 6: Final answer
    x = 541,513.55

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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.