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Finding the Fourth Proportional to 8,979, 12,391.14 and 5,255.16

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Solution

The fourth proportional to 8,979, 12,391.14 and 5,255.16 is: 7,252.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979 : 12,391.14 = 5,255.16 : x
  2. Step 2: Convert to fraction form
    8,979/12,391.14 = 5,255.16/x
  3. Step 3: Cross multiply
    8,979x = 12,391.14 × 5,255.16
  4. Step 4: Simplify right side
    8,979x = 65,117,423.28
  5. Step 5: Solve for x
    x = 65,117,423.28/8,979
  6. Step 6: Final answer
    x = 7,252.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.