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Finding the Fourth Proportional to 87,992.60, 121,499.70 and 81,275.81

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Solution

The fourth proportional to 87,992.60, 121,499.70 and 81,275.81 is: 112,225.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,992.60 : 121,499.70 = 81,275.81 : x
  2. Step 2: Convert to fraction form
    87,992.60/121,499.70 = 81,275.81/x
  3. Step 3: Cross multiply
    87,992.60x = 121,499.70 × 81,275.81
  4. Step 4: Simplify right side
    87,992.60x = 9,874,986,532.26
  5. Step 5: Solve for x
    x = 9,874,986,532.26/87,992.60
  6. Step 6: Final answer
    x = 112,225.19

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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.