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Finding the Fourth Proportional to 75,393.12, 112,938.84 and 45,390.72

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Solution

The fourth proportional to 75,393.12, 112,938.84 and 45,390.72 is: 67,995.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,393.12 : 112,938.84 = 45,390.72 : x
  2. Step 2: Convert to fraction form
    75,393.12/112,938.84 = 45,390.72/x
  3. Step 3: Cross multiply
    75,393.12x = 112,938.84 × 45,390.72
  4. Step 4: Simplify right side
    75,393.12x = 5,126,375,263.56
  5. Step 5: Solve for x
    x = 5,126,375,263.56/75,393.12
  6. Step 6: Final answer
    x = 67,995.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.