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Finding the Fourth Proportional to 86,092.80, 128,761.46 and 76,671.55

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Solution

The fourth proportional to 86,092.80, 128,761.46 and 76,671.55 is: 114,670.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,092.80 : 128,761.46 = 76,671.55 : x
  2. Step 2: Convert to fraction form
    86,092.80/128,761.46 = 76,671.55/x
  3. Step 3: Cross multiply
    86,092.80x = 128,761.46 × 76,671.55
  4. Step 4: Simplify right side
    86,092.80x = 9,872,340,718.46
  5. Step 5: Solve for x
    x = 9,872,340,718.46/86,092.80
  6. Step 6: Final answer
    x = 114,670.92

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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.