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Finding the Fourth Proportional to 15,143.82, 20,898.12 and 8,429.04

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Solution

The fourth proportional to 15,143.82, 20,898.12 and 8,429.04 is: 11,631.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,143.82 : 20,898.12 = 8,429.04 : x
  2. Step 2: Convert to fraction form
    15,143.82/20,898.12 = 8,429.04/x
  3. Step 3: Cross multiply
    15,143.82x = 20,898.12 × 8,429.04
  4. Step 4: Simplify right side
    15,143.82x = 176,151,089.40
  5. Step 5: Solve for x
    x = 176,151,089.40/15,143.82
  6. Step 6: Final answer
    x = 11,631.88

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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.