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Finding the Fourth Proportional to 316,915.20, 475,372.80 and 139,233.60

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Solution

The fourth proportional to 316,915.20, 475,372.80 and 139,233.60 is: 208,850.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,915.20 : 475,372.80 = 139,233.60 : x
  2. Step 2: Convert to fraction form
    316,915.20/475,372.80 = 139,233.60/x
  3. Step 3: Cross multiply
    316,915.20x = 475,372.80 × 139,233.60
  4. Step 4: Simplify right side
    316,915.20x = 66,187,866,286.08
  5. Step 5: Solve for x
    x = 66,187,866,286.08/316,915.20
  6. Step 6: Final answer
    x = 208,850.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.