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Finding the Fourth Proportional to 161.70, 242.80 and 143.47

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Solution

The fourth proportional to 161.70, 242.80 and 143.47 is: 215.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.70 : 242.80 = 143.47 : x
  2. Step 2: Convert to fraction form
    161.70/242.80 = 143.47/x
  3. Step 3: Cross multiply
    161.70x = 242.80 × 143.47
  4. Step 4: Simplify right side
    161.70x = 34,834.46
  5. Step 5: Solve for x
    x = 34,834.46/161.70
  6. Step 6: Final answer
    x = 215.43

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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.