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Finding the Fourth Proportional to 962.56, 1,442.64 and 638.20

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Solution

The fourth proportional to 962.56, 1,442.64 and 638.20 is: 956.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    962.56 : 1,442.64 = 638.20 : x
  2. Step 2: Convert to fraction form
    962.56/1,442.64 = 638.20/x
  3. Step 3: Cross multiply
    962.56x = 1,442.64 × 638.20
  4. Step 4: Simplify right side
    962.56x = 920,692.85
  5. Step 5: Solve for x
    x = 920,692.85/962.56
  6. Step 6: Final answer
    x = 956.50

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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.