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Finding the Fourth Proportional to 138,407.52, 191,003.04 and 77,979.12

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Solution

The fourth proportional to 138,407.52, 191,003.04 and 77,979.12 is: 107,611.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,407.52 : 191,003.04 = 77,979.12 : x
  2. Step 2: Convert to fraction form
    138,407.52/191,003.04 = 77,979.12/x
  3. Step 3: Cross multiply
    138,407.52x = 191,003.04 × 77,979.12
  4. Step 4: Simplify right side
    138,407.52x = 14,894,248,976.52
  5. Step 5: Solve for x
    x = 14,894,248,976.52/138,407.52
  6. Step 6: Final answer
    x = 107,611.56

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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.