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Finding the Fourth Proportional to 161.19, 242.18 and 103.43

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Solution

The fourth proportional to 161.19, 242.18 and 103.43 is: 155.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.19 : 242.18 = 103.43 : x
  2. Step 2: Convert to fraction form
    161.19/242.18 = 103.43/x
  3. Step 3: Cross multiply
    161.19x = 242.18 × 103.43
  4. Step 4: Simplify right side
    161.19x = 25,048.16
  5. Step 5: Solve for x
    x = 25,048.16/161.19
  6. Step 6: Final answer
    x = 155.40

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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.