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Finding the Fourth Proportional to 28,711.32, 43,079.31 and 9,981.15

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Solution

The fourth proportional to 28,711.32, 43,079.31 and 9,981.15 is: 14,976.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,711.32 : 43,079.31 = 9,981.15 : x
  2. Step 2: Convert to fraction form
    28,711.32/43,079.31 = 9,981.15/x
  3. Step 3: Cross multiply
    28,711.32x = 43,079.31 × 9,981.15
  4. Step 4: Simplify right side
    28,711.32x = 429,981,055.01
  5. Step 5: Solve for x
    x = 429,981,055.01/28,711.32
  6. Step 6: Final answer
    x = 14,976.01

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1.5x scale

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.