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Finding the Fourth Proportional to 91,411.70, 137,117.55 and 77,998.10

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Solution

The fourth proportional to 91,411.70, 137,117.55 and 77,998.10 is: 116,997.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,411.70 : 137,117.55 = 77,998.10 : x
  2. Step 2: Convert to fraction form
    91,411.70/137,117.55 = 77,998.10/x
  3. Step 3: Cross multiply
    91,411.70x = 137,117.55 × 77,998.10
  4. Step 4: Simplify right side
    91,411.70x = 10,694,908,376.66
  5. Step 5: Solve for x
    x = 10,694,908,376.66/91,411.70
  6. Step 6: Final answer
    x = 116,997.15

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.