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Finding the Fourth Proportional to 680.24, 939.12 and 448.04

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Solution

The fourth proportional to 680.24, 939.12 and 448.04 is: 618.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.24 : 939.12 = 448.04 : x
  2. Step 2: Convert to fraction form
    680.24/939.12 = 448.04/x
  3. Step 3: Cross multiply
    680.24x = 939.12 × 448.04
  4. Step 4: Simplify right side
    680.24x = 420,763.32
  5. Step 5: Solve for x
    x = 420,763.32/680.24
  6. Step 6: Final answer
    x = 618.55

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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.