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Finding the Fourth Proportional to 985.20, 1,359.20 and 635.28

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Solution

The fourth proportional to 985.20, 1,359.20 and 635.28 is: 876.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.20 : 1,359.20 = 635.28 : x
  2. Step 2: Convert to fraction form
    985.20/1,359.20 = 635.28/x
  3. Step 3: Cross multiply
    985.20x = 1,359.20 × 635.28
  4. Step 4: Simplify right side
    985.20x = 863,472.58
  5. Step 5: Solve for x
    x = 863,472.58/985.20
  6. Step 6: Final answer
    x = 876.44

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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.