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Finding the Fourth Proportional to 25,400.70, 38,101.05 and 12,915.90

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Solution

The fourth proportional to 25,400.70, 38,101.05 and 12,915.90 is: 19,373.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,400.70 : 38,101.05 = 12,915.90 : x
  2. Step 2: Convert to fraction form
    25,400.70/38,101.05 = 12,915.90/x
  3. Step 3: Cross multiply
    25,400.70x = 38,101.05 × 12,915.90
  4. Step 4: Simplify right side
    25,400.70x = 492,109,351.70
  5. Step 5: Solve for x
    x = 492,109,351.70/25,400.70
  6. Step 6: Final answer
    x = 19,373.85

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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.