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Finding the Fourth Proportional to 93,096.80, 128,149.14 and 81,139.38

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Solution

The fourth proportional to 93,096.80, 128,149.14 and 81,139.38 is: 111,689.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,096.80 : 128,149.14 = 81,139.38 : x
  2. Step 2: Convert to fraction form
    93,096.80/128,149.14 = 81,139.38/x
  3. Step 3: Cross multiply
    93,096.80x = 128,149.14 × 81,139.38
  4. Step 4: Simplify right side
    93,096.80x = 10,397,941,767.13
  5. Step 5: Solve for x
    x = 10,397,941,767.13/93,096.80
  6. Step 6: Final answer
    x = 111,689.57

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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.