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Finding the Fourth Proportional to 138,990.87, 191,807.34 and 75,328.65

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Solution

The fourth proportional to 138,990.87, 191,807.34 and 75,328.65 is: 103,953.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,990.87 : 191,807.34 = 75,328.65 : x
  2. Step 2: Convert to fraction form
    138,990.87/191,807.34 = 75,328.65/x
  3. Step 3: Cross multiply
    138,990.87x = 191,807.34 × 75,328.65
  4. Step 4: Simplify right side
    138,990.87x = 14,448,587,982.29
  5. Step 5: Solve for x
    x = 14,448,587,982.29/138,990.87
  6. Step 6: Final answer
    x = 103,953.50

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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.