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Finding the Fourth Proportional to 15,143.65, 20,895.80 and 8,429.11

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Solution

The fourth proportional to 15,143.65, 20,895.80 and 8,429.11 is: 11,630.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,143.65 : 20,895.80 = 8,429.11 : x
  2. Step 2: Convert to fraction form
    15,143.65/20,895.80 = 8,429.11/x
  3. Step 3: Cross multiply
    15,143.65x = 20,895.80 × 8,429.11
  4. Step 4: Simplify right side
    15,143.65x = 176,132,902.35
  5. Step 5: Solve for x
    x = 176,132,902.35/15,143.65
  6. Step 6: Final answer
    x = 11,630.81

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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.