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Finding the Fourth Proportional to 138,875.73, 191,660.31 and 78,457.46

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Solution

The fourth proportional to 138,875.73, 191,660.31 and 78,457.46 is: 108,277.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,875.73 : 191,660.31 = 78,457.46 : x
  2. Step 2: Convert to fraction form
    138,875.73/191,660.31 = 78,457.46/x
  3. Step 3: Cross multiply
    138,875.73x = 191,660.31 × 78,457.46
  4. Step 4: Simplify right side
    138,875.73x = 15,037,180,713.13
  5. Step 5: Solve for x
    x = 15,037,180,713.13/138,875.73
  6. Step 6: Final answer
    x = 108,277.96

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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.