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Finding the Fourth Proportional to 112,689.97, 168,785.80 and 77,066.87

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Solution

The fourth proportional to 112,689.97, 168,785.80 and 77,066.87 is: 115,429.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,689.97 : 168,785.80 = 77,066.87 : x
  2. Step 2: Convert to fraction form
    112,689.97/168,785.80 = 77,066.87/x
  3. Step 3: Cross multiply
    112,689.97x = 168,785.80 × 77,066.87
  4. Step 4: Simplify right side
    112,689.97x = 13,007,792,077.18
  5. Step 5: Solve for x
    x = 13,007,792,077.18/112,689.97
  6. Step 6: Final answer
    x = 115,429.90

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1.5x scale

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.