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Finding the Fourth Proportional to 86,781.40, 130,172.10 and 85,859.80

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Solution

The fourth proportional to 86,781.40, 130,172.10 and 85,859.80 is: 128,789.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,781.40 : 130,172.10 = 85,859.80 : x
  2. Step 2: Convert to fraction form
    86,781.40/130,172.10 = 85,859.80/x
  3. Step 3: Cross multiply
    86,781.40x = 130,172.10 × 85,859.80
  4. Step 4: Simplify right side
    86,781.40x = 11,176,550,471.58
  5. Step 5: Solve for x
    x = 11,176,550,471.58/86,781.40
  6. Step 6: Final answer
    x = 128,789.70

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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.