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Finding the Fourth Proportional to 125,643.80, 188,465.70 and 91,818.20

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Solution

The fourth proportional to 125,643.80, 188,465.70 and 91,818.20 is: 137,727.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,643.80 : 188,465.70 = 91,818.20 : x
  2. Step 2: Convert to fraction form
    125,643.80/188,465.70 = 91,818.20/x
  3. Step 3: Cross multiply
    125,643.80x = 188,465.70 × 91,818.20
  4. Step 4: Simplify right side
    125,643.80x = 17,304,581,335.74
  5. Step 5: Solve for x
    x = 17,304,581,335.74/125,643.80
  6. Step 6: Final answer
    x = 137,727.30

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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.