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Finding the Fourth Proportional to 9,339, 12,887.88 and 5,147.28

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Solution

The fourth proportional to 9,339, 12,887.88 and 5,147.28 is: 7,103.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,339 : 12,887.88 = 5,147.28 : x
  2. Step 2: Convert to fraction form
    9,339/12,887.88 = 5,147.28/x
  3. Step 3: Cross multiply
    9,339x = 12,887.88 × 5,147.28
  4. Step 4: Simplify right side
    9,339x = 66,337,526.97
  5. Step 5: Solve for x
    x = 66,337,526.97/9,339
  6. Step 6: Final answer
    x = 7,103.28

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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.