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Finding the Fourth Proportional to 661.95, 913.48 and 363.20

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Solution

The fourth proportional to 661.95, 913.48 and 363.20 is: 501.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.95 : 913.48 = 363.20 : x
  2. Step 2: Convert to fraction form
    661.95/913.48 = 363.20/x
  3. Step 3: Cross multiply
    661.95x = 913.48 × 363.20
  4. Step 4: Simplify right side
    661.95x = 331,775.25
  5. Step 5: Solve for x
    x = 331,775.25/661.95
  6. Step 6: Final answer
    x = 501.21

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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.