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Finding the Fourth Proportional to 678,276.60, 936,096 and 387,915.12

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Solution

The fourth proportional to 678,276.60, 936,096 and 387,915.12 is: 535,365.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,276.60 : 936,096 = 387,915.12 : x
  2. Step 2: Convert to fraction form
    678,276.60/936,096 = 387,915.12/x
  3. Step 3: Cross multiply
    678,276.60x = 936,096 × 387,915.12
  4. Step 4: Simplify right side
    678,276.60x = 363,125,792,171.52
  5. Step 5: Solve for x
    x = 363,125,792,171.52/678,276.60
  6. Step 6: Final answer
    x = 535,365.35

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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.