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Finding the Fourth Proportional to 318,487.80, 439,499.99 and 173,294.18

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Solution

The fourth proportional to 318,487.80, 439,499.99 and 173,294.18 is: 239,138.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,487.80 : 439,499.99 = 173,294.18 : x
  2. Step 2: Convert to fraction form
    318,487.80/439,499.99 = 173,294.18/x
  3. Step 3: Cross multiply
    318,487.80x = 439,499.99 × 173,294.18
  4. Step 4: Simplify right side
    318,487.80x = 76,162,792,733.11
  5. Step 5: Solve for x
    x = 76,162,792,733.11/318,487.80
  6. Step 6: Final answer
    x = 239,138.81

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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.