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Finding the Fourth Proportional to 138,990.77, 191,806.49 and 75,328.55

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Solution

The fourth proportional to 138,990.77, 191,806.49 and 75,328.55 is: 103,952.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,990.77 : 191,806.49 = 75,328.55 : x
  2. Step 2: Convert to fraction form
    138,990.77/191,806.49 = 75,328.55/x
  3. Step 3: Cross multiply
    138,990.77x = 191,806.49 × 75,328.55
  4. Step 4: Simplify right side
    138,990.77x = 14,448,504,395.65
  5. Step 5: Solve for x
    x = 14,448,504,395.65/138,990.77
  6. Step 6: Final answer
    x = 103,952.98

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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.