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Finding the Fourth Proportional to 86,131.80, 128,833.20 and 77,310.90

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Solution

The fourth proportional to 86,131.80, 128,833.20 and 77,310.90 is: 115,639.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,131.80 : 128,833.20 = 77,310.90 : x
  2. Step 2: Convert to fraction form
    86,131.80/128,833.20 = 77,310.90/x
  3. Step 3: Cross multiply
    86,131.80x = 128,833.20 × 77,310.90
  4. Step 4: Simplify right side
    86,131.80x = 9,960,210,641.88
  5. Step 5: Solve for x
    x = 9,960,210,641.88/86,131.80
  6. Step 6: Final answer
    x = 115,639.18

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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.