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Finding the Fourth Proportional to 8,387.20, 12,586.20 and 4,877.20

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Solution

The fourth proportional to 8,387.20, 12,586.20 and 4,877.20 is: 7,318.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,387.20 : 12,586.20 = 4,877.20 : x
  2. Step 2: Convert to fraction form
    8,387.20/12,586.20 = 4,877.20/x
  3. Step 3: Cross multiply
    8,387.20x = 12,586.20 × 4,877.20
  4. Step 4: Simplify right side
    8,387.20x = 61,385,414.64
  5. Step 5: Solve for x
    x = 61,385,414.64/8,387.20
  6. Step 6: Final answer
    x = 7,318.94

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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.