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Finding the Fourth Proportional to 71,543.70, 107,315.55 and 45,278.10

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Solution

The fourth proportional to 71,543.70, 107,315.55 and 45,278.10 is: 67,917.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,543.70 : 107,315.55 = 45,278.10 : x
  2. Step 2: Convert to fraction form
    71,543.70/107,315.55 = 45,278.10/x
  3. Step 3: Cross multiply
    71,543.70x = 107,315.55 × 45,278.10
  4. Step 4: Simplify right side
    71,543.70x = 4,859,044,204.46
  5. Step 5: Solve for x
    x = 4,859,044,204.46/71,543.70
  6. Step 6: Final answer
    x = 67,917.15

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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.