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Finding the Fourth Proportional to 161.57, 242.15 and 70.18

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Solution

The fourth proportional to 161.57, 242.15 and 70.18 is: 105.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.57 : 242.15 = 70.18 : x
  2. Step 2: Convert to fraction form
    161.57/242.15 = 70.18/x
  3. Step 3: Cross multiply
    161.57x = 242.15 × 70.18
  4. Step 4: Simplify right side
    161.57x = 16,992.53
  5. Step 5: Solve for x
    x = 16,992.53/161.57
  6. Step 6: Final answer
    x = 105.17

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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.