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Finding the Fourth Proportional to 126,690.88, 174,838.08 and 81,978.88

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Solution

The fourth proportional to 126,690.88, 174,838.08 and 81,978.88 is: 113,133.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,690.88 : 174,838.08 = 81,978.88 : x
  2. Step 2: Convert to fraction form
    126,690.88/174,838.08 = 81,978.88/x
  3. Step 3: Cross multiply
    126,690.88x = 174,838.08 × 81,978.88
  4. Step 4: Simplify right side
    126,690.88x = 14,333,029,979.75
  5. Step 5: Solve for x
    x = 14,333,029,979.75/126,690.88
  6. Step 6: Final answer
    x = 113,133.87

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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.