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Finding the Fourth Proportional to 138,560.61, 191,197.39 and 78,127.65

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Solution

The fourth proportional to 138,560.61, 191,197.39 and 78,127.65 is: 107,806.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,560.61 : 191,197.39 = 78,127.65 : x
  2. Step 2: Convert to fraction form
    138,560.61/191,197.39 = 78,127.65/x
  3. Step 3: Cross multiply
    138,560.61x = 191,197.39 × 78,127.65
  4. Step 4: Simplify right side
    138,560.61x = 14,937,802,766.83
  5. Step 5: Solve for x
    x = 14,937,802,766.83/138,560.61
  6. Step 6: Final answer
    x = 107,806.99

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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.