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Finding the Fourth Proportional to 161.70, 242.65 and 84.70

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Solution

The fourth proportional to 161.70, 242.65 and 84.70 is: 127.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.70 : 242.65 = 84.70 : x
  2. Step 2: Convert to fraction form
    161.70/242.65 = 84.70/x
  3. Step 3: Cross multiply
    161.70x = 242.65 × 84.70
  4. Step 4: Simplify right side
    161.70x = 20,551.02
  5. Step 5: Solve for x
    x = 20,551.02/161.70
  6. Step 6: Final answer
    x = 127.10

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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.