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Finding the Fourth Proportional to 11,385.60, 17,078.40 and 10,118.40

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Solution

The fourth proportional to 11,385.60, 17,078.40 and 10,118.40 is: 15,177.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,385.60 : 17,078.40 = 10,118.40 : x
  2. Step 2: Convert to fraction form
    11,385.60/17,078.40 = 10,118.40/x
  3. Step 3: Cross multiply
    11,385.60x = 17,078.40 × 10,118.40
  4. Step 4: Simplify right side
    11,385.60x = 172,806,082.56
  5. Step 5: Solve for x
    x = 172,806,082.56/11,385.60
  6. Step 6: Final answer
    x = 15,177.60

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1.5x scale

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.