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Finding the Fourth Proportional to 708.40, 1,061.25 and 415.18

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Solution

The fourth proportional to 708.40, 1,061.25 and 415.18 is: 621.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.40 : 1,061.25 = 415.18 : x
  2. Step 2: Convert to fraction form
    708.40/1,061.25 = 415.18/x
  3. Step 3: Cross multiply
    708.40x = 1,061.25 × 415.18
  4. Step 4: Simplify right side
    708.40x = 440,609.78
  5. Step 5: Solve for x
    x = 440,609.78/708.40
  6. Step 6: Final answer
    x = 621.98

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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.