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Finding the Fourth Proportional to 8,472.40, 12,708.60 and 4,098.40

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Solution

The fourth proportional to 8,472.40, 12,708.60 and 4,098.40 is: 6,147.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,472.40 : 12,708.60 = 4,098.40 : x
  2. Step 2: Convert to fraction form
    8,472.40/12,708.60 = 4,098.40/x
  3. Step 3: Cross multiply
    8,472.40x = 12,708.60 × 4,098.40
  4. Step 4: Simplify right side
    8,472.40x = 52,084,926.24
  5. Step 5: Solve for x
    x = 52,084,926.24/8,472.40
  6. Step 6: Final answer
    x = 6,147.60

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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.