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Finding the Fourth Proportional to 74,911.80, 112,310.10 and 42,079.80

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Solution

The fourth proportional to 74,911.80, 112,310.10 and 42,079.80 is: 63,087.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,911.80 : 112,310.10 = 42,079.80 : x
  2. Step 2: Convert to fraction form
    74,911.80/112,310.10 = 42,079.80/x
  3. Step 3: Cross multiply
    74,911.80x = 112,310.10 × 42,079.80
  4. Step 4: Simplify right side
    74,911.80x = 4,725,986,545.98
  5. Step 5: Solve for x
    x = 4,725,986,545.98/74,911.80
  6. Step 6: Final answer
    x = 63,087.34

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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.