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Finding the Fourth Proportional to 9,712.80, 14,572.80 and 3,139.20

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Solution

The fourth proportional to 9,712.80, 14,572.80 and 3,139.20 is: 4,709.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,712.80 : 14,572.80 = 3,139.20 : x
  2. Step 2: Convert to fraction form
    9,712.80/14,572.80 = 3,139.20/x
  3. Step 3: Cross multiply
    9,712.80x = 14,572.80 × 3,139.20
  4. Step 4: Simplify right side
    9,712.80x = 45,746,933.76
  5. Step 5: Solve for x
    x = 45,746,933.76/9,712.80
  6. Step 6: Final answer
    x = 4,709.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.