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Finding the Fourth Proportional to 111,310.68, 153,812.40 and 81,043.44

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Solution

The fourth proportional to 111,310.68, 153,812.40 and 81,043.44 is: 111,988.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,310.68 : 153,812.40 = 81,043.44 : x
  2. Step 2: Convert to fraction form
    111,310.68/153,812.40 = 81,043.44/x
  3. Step 3: Cross multiply
    111,310.68x = 153,812.40 × 81,043.44
  4. Step 4: Simplify right side
    111,310.68x = 12,465,486,010.66
  5. Step 5: Solve for x
    x = 12,465,486,010.66/111,310.68
  6. Step 6: Final answer
    x = 111,988.23

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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.