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Finding the Fourth Proportional to 463.80, 695.56 and 139.20

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Solution

The fourth proportional to 463.80, 695.56 and 139.20 is: 208.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.80 : 695.56 = 139.20 : x
  2. Step 2: Convert to fraction form
    463.80/695.56 = 139.20/x
  3. Step 3: Cross multiply
    463.80x = 695.56 × 139.20
  4. Step 4: Simplify right side
    463.80x = 96,821.95
  5. Step 5: Solve for x
    x = 96,821.95/463.80
  6. Step 6: Final answer
    x = 208.76

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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.