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Finding the Fourth Proportional to 15,201.20, 20,965.56 and 11,248.40

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Solution

The fourth proportional to 15,201.20, 20,965.56 and 11,248.40 is: 15,513.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,201.20 : 20,965.56 = 11,248.40 : x
  2. Step 2: Convert to fraction form
    15,201.20/20,965.56 = 11,248.40/x
  3. Step 3: Cross multiply
    15,201.20x = 20,965.56 × 11,248.40
  4. Step 4: Simplify right side
    15,201.20x = 235,829,005.10
  5. Step 5: Solve for x
    x = 235,829,005.10/15,201.20
  6. Step 6: Final answer
    x = 15,513.84

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1.5x scale

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.