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Finding the Fourth Proportional to 657.90, 988.20 and 636.03

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Solution

The fourth proportional to 657.90, 988.20 and 636.03 is: 955.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.90 : 988.20 = 636.03 : x
  2. Step 2: Convert to fraction form
    657.90/988.20 = 636.03/x
  3. Step 3: Cross multiply
    657.90x = 988.20 × 636.03
  4. Step 4: Simplify right side
    657.90x = 628,521.67
  5. Step 5: Solve for x
    x = 628,521.67/657.90
  6. Step 6: Final answer
    x = 955.35

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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.