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Finding the Fourth Proportional to 138,616.71, 191,290.80 and 78,187.17

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Solution

The fourth proportional to 138,616.71, 191,290.80 and 78,187.17 is: 107,898.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,616.71 : 191,290.80 = 78,187.17 : x
  2. Step 2: Convert to fraction form
    138,616.71/191,290.80 = 78,187.17/x
  3. Step 3: Cross multiply
    138,616.71x = 191,290.80 × 78,187.17
  4. Step 4: Simplify right side
    138,616.71x = 14,956,486,299.04
  5. Step 5: Solve for x
    x = 14,956,486,299.04/138,616.71
  6. Step 6: Final answer
    x = 107,898.15

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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.