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Finding the Fourth Proportional to 138,904.39, 191,684.12 and 81,542.80

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Solution

The fourth proportional to 138,904.39, 191,684.12 and 81,542.80 is: 112,526.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,904.39 : 191,684.12 = 81,542.80 : x
  2. Step 2: Convert to fraction form
    138,904.39/191,684.12 = 81,542.80/x
  3. Step 3: Cross multiply
    138,904.39x = 191,684.12 × 81,542.80
  4. Step 4: Simplify right side
    138,904.39x = 15,630,459,841.13
  5. Step 5: Solve for x
    x = 15,630,459,841.13/138,904.39
  6. Step 6: Final answer
    x = 112,526.75

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1.5x scale

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.