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Finding the Fourth Proportional to 60,978.85, 91,401.55 and 31,398.46

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Solution

The fourth proportional to 60,978.85, 91,401.55 and 31,398.46 is: 47,063.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,978.85 : 91,401.55 = 31,398.46 : x
  2. Step 2: Convert to fraction form
    60,978.85/91,401.55 = 31,398.46/x
  3. Step 3: Cross multiply
    60,978.85x = 91,401.55 × 31,398.46
  4. Step 4: Simplify right side
    60,978.85x = 2,869,867,604.61
  5. Step 5: Solve for x
    x = 2,869,867,604.61/60,978.85
  6. Step 6: Final answer
    x = 47,063.33

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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.