Home / 138,737.12-191,456.40-78,308.48

Finding the Fourth Proportional to 138,737.12, 191,456.40 and 78,308.48

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Solution

The fourth proportional to 138,737.12, 191,456.40 and 78,308.48 is: 108,065.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,737.12 : 191,456.40 = 78,308.48 : x
  2. Step 2: Convert to fraction form
    138,737.12/191,456.40 = 78,308.48/x
  3. Step 3: Cross multiply
    138,737.12x = 191,456.40 × 78,308.48
  4. Step 4: Simplify right side
    138,737.12x = 14,992,659,670.27
  5. Step 5: Solve for x
    x = 14,992,659,670.27/138,737.12
  6. Step 6: Final answer
    x = 108,065.24

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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.