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Finding the Fourth Proportional to 8,487.30, 12,720.54 and 4,979.04

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Solution

The fourth proportional to 8,487.30, 12,720.54 and 4,979.04 is: 7,462.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,487.30 : 12,720.54 = 4,979.04 : x
  2. Step 2: Convert to fraction form
    8,487.30/12,720.54 = 4,979.04/x
  3. Step 3: Cross multiply
    8,487.30x = 12,720.54 × 4,979.04
  4. Step 4: Simplify right side
    8,487.30x = 63,336,077.48
  5. Step 5: Solve for x
    x = 63,336,077.48/8,487.30
  6. Step 6: Final answer
    x = 7,462.45

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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.