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Finding the Fourth Proportional to 8,661.92, 12,960.36 and 5,139.02

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Solution

The fourth proportional to 8,661.92, 12,960.36 and 5,139.02 is: 7,689.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,661.92 : 12,960.36 = 5,139.02 : x
  2. Step 2: Convert to fraction form
    8,661.92/12,960.36 = 5,139.02/x
  3. Step 3: Cross multiply
    8,661.92x = 12,960.36 × 5,139.02
  4. Step 4: Simplify right side
    8,661.92x = 66,603,549.25
  5. Step 5: Solve for x
    x = 66,603,549.25/8,661.92
  6. Step 6: Final answer
    x = 7,689.24

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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.