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Finding the Fourth Proportional to 86,649.60, 129,715.20 and 81,523.20

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Solution

The fourth proportional to 86,649.60, 129,715.20 and 81,523.20 is: 122,040.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,649.60 : 129,715.20 = 81,523.20 : x
  2. Step 2: Convert to fraction form
    86,649.60/129,715.20 = 81,523.20/x
  3. Step 3: Cross multiply
    86,649.60x = 129,715.20 × 81,523.20
  4. Step 4: Simplify right side
    86,649.60x = 10,574,798,192.64
  5. Step 5: Solve for x
    x = 10,574,798,192.64/86,649.60
  6. Step 6: Final answer
    x = 122,040.93

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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.