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Finding the Fourth Proportional to 8,791, 12,128.72 and 6,139.87

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Solution

The fourth proportional to 8,791, 12,128.72 and 6,139.87 is: 8,471.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,791 : 12,128.72 = 6,139.87 : x
  2. Step 2: Convert to fraction form
    8,791/12,128.72 = 6,139.87/x
  3. Step 3: Cross multiply
    8,791x = 12,128.72 × 6,139.87
  4. Step 4: Simplify right side
    8,791x = 74,468,764.07
  5. Step 5: Solve for x
    x = 74,468,764.07/8,791
  6. Step 6: Final answer
    x = 8,471.02

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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.