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Finding the Fourth Proportional to 655.20, 900 and 635.76

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Solution

The fourth proportional to 655.20, 900 and 635.76 is: 873.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.20 : 900 = 635.76 : x
  2. Step 2: Convert to fraction form
    655.20/900 = 635.76/x
  3. Step 3: Cross multiply
    655.20x = 900 × 635.76
  4. Step 4: Simplify right side
    655.20x = 572,184
  5. Step 5: Solve for x
    x = 572,184/655.20
  6. Step 6: Final answer
    x = 873.30

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.