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Finding the Fourth Proportional to 138,718.72, 191,431.80 and 75,056.52

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Solution

The fourth proportional to 138,718.72, 191,431.80 and 75,056.52 is: 103,577.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,718.72 : 191,431.80 = 75,056.52 : x
  2. Step 2: Convert to fraction form
    138,718.72/191,431.80 = 75,056.52/x
  3. Step 3: Cross multiply
    138,718.72x = 191,431.80 × 75,056.52
  4. Step 4: Simplify right side
    138,718.72x = 14,368,204,725.34
  5. Step 5: Solve for x
    x = 14,368,204,725.34/138,718.72
  6. Step 6: Final answer
    x = 103,577.98

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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.