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Finding the Fourth Proportional to 15,143.39, 20,895.90 and 8,429.30

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Solution

The fourth proportional to 15,143.39, 20,895.90 and 8,429.30 is: 11,631.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,143.39 : 20,895.90 = 8,429.30 : x
  2. Step 2: Convert to fraction form
    15,143.39/20,895.90 = 8,429.30/x
  3. Step 3: Cross multiply
    15,143.39x = 20,895.90 × 8,429.30
  4. Step 4: Simplify right side
    15,143.39x = 176,137,862.11
  5. Step 5: Solve for x
    x = 176,137,862.11/15,143.39
  6. Step 6: Final answer
    x = 11,631.33

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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.