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Finding the Fourth Proportional to 12,470.79, 18,706.18 and 8,318.90

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Solution

The fourth proportional to 12,470.79, 18,706.18 and 8,318.90 is: 12,478.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,470.79 : 18,706.18 = 8,318.90 : x
  2. Step 2: Convert to fraction form
    12,470.79/18,706.18 = 8,318.90/x
  3. Step 3: Cross multiply
    12,470.79x = 18,706.18 × 8,318.90
  4. Step 4: Simplify right side
    12,470.79x = 155,614,799.21
  5. Step 5: Solve for x
    x = 155,614,799.21/12,470.79
  6. Step 6: Final answer
    x = 12,478.35

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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.