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Finding the Fourth Proportional to 18,870.92, 28,306.38 and 8,470.52

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Solution

The fourth proportional to 18,870.92, 28,306.38 and 8,470.52 is: 12,705.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.92 : 28,306.38 = 8,470.52 : x
  2. Step 2: Convert to fraction form
    18,870.92/28,306.38 = 8,470.52/x
  3. Step 3: Cross multiply
    18,870.92x = 28,306.38 × 8,470.52
  4. Step 4: Simplify right side
    18,870.92x = 239,769,574.03
  5. Step 5: Solve for x
    x = 239,769,574.03/18,870.92
  6. Step 6: Final answer
    x = 12,705.77

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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.