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Finding the Fourth Proportional to 138,878.76, 191,649.06 and 78,454.92

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Solution

The fourth proportional to 138,878.76, 191,649.06 and 78,454.92 is: 108,265.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,878.76 : 191,649.06 = 78,454.92 : x
  2. Step 2: Convert to fraction form
    138,878.76/191,649.06 = 78,454.92/x
  3. Step 3: Cross multiply
    138,878.76x = 191,649.06 × 78,454.92
  4. Step 4: Simplify right side
    138,878.76x = 15,035,811,670.38
  5. Step 5: Solve for x
    x = 15,035,811,670.38/138,878.76
  6. Step 6: Final answer
    x = 108,265.74

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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.