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Finding the Fourth Proportional to 242.18, 362.99 and 139.53

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Solution

The fourth proportional to 242.18, 362.99 and 139.53 is: 209.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.18 : 362.99 = 139.53 : x
  2. Step 2: Convert to fraction form
    242.18/362.99 = 139.53/x
  3. Step 3: Cross multiply
    242.18x = 362.99 × 139.53
  4. Step 4: Simplify right side
    242.18x = 50,647.30
  5. Step 5: Solve for x
    x = 50,647.30/242.18
  6. Step 6: Final answer
    x = 209.14

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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.