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Finding the Fourth Proportional to 138,990.73, 191,807.88 and 75,328.51

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Solution

The fourth proportional to 138,990.73, 191,807.88 and 75,328.51 is: 103,953.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,990.73 : 191,807.88 = 75,328.51 : x
  2. Step 2: Convert to fraction form
    138,990.73/191,807.88 = 75,328.51/x
  3. Step 3: Cross multiply
    138,990.73x = 191,807.88 × 75,328.51
  4. Step 4: Simplify right side
    138,990.73x = 14,448,601,806.66
  5. Step 5: Solve for x
    x = 14,448,601,806.66/138,990.73
  6. Step 6: Final answer
    x = 103,953.71

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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.