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Finding the Fourth Proportional to 15,159.64, 20,920.95 and 8,445.28

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Solution

The fourth proportional to 15,159.64, 20,920.95 and 8,445.28 is: 11,654.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.64 : 20,920.95 = 8,445.28 : x
  2. Step 2: Convert to fraction form
    15,159.64/20,920.95 = 8,445.28/x
  3. Step 3: Cross multiply
    15,159.64x = 20,920.95 × 8,445.28
  4. Step 4: Simplify right side
    15,159.64x = 176,683,280.62
  5. Step 5: Solve for x
    x = 176,683,280.62/15,159.64
  6. Step 6: Final answer
    x = 11,654.85

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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.