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Finding the Fourth Proportional to 636.72, 959.80 and 529.20

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Solution

The fourth proportional to 636.72, 959.80 and 529.20 is: 797.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.72 : 959.80 = 529.20 : x
  2. Step 2: Convert to fraction form
    636.72/959.80 = 529.20/x
  3. Step 3: Cross multiply
    636.72x = 959.80 × 529.20
  4. Step 4: Simplify right side
    636.72x = 507,926.16
  5. Step 5: Solve for x
    x = 507,926.16/636.72
  6. Step 6: Final answer
    x = 797.72

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.