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Finding the Fourth Proportional to 178.65, 268.10 and 70.43

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Solution

The fourth proportional to 178.65, 268.10 and 70.43 is: 105.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.65 : 268.10 = 70.43 : x
  2. Step 2: Convert to fraction form
    178.65/268.10 = 70.43/x
  3. Step 3: Cross multiply
    178.65x = 268.10 × 70.43
  4. Step 4: Simplify right side
    178.65x = 18,883.13
  5. Step 5: Solve for x
    x = 18,883.13/178.65
  6. Step 6: Final answer
    x = 105.70

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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.