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Finding the Fourth Proportional to 178.08, 245.61 and 153.78

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Solution

The fourth proportional to 178.08, 245.61 and 153.78 is: 212.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.08 : 245.61 = 153.78 : x
  2. Step 2: Convert to fraction form
    178.08/245.61 = 153.78/x
  3. Step 3: Cross multiply
    178.08x = 245.61 × 153.78
  4. Step 4: Simplify right side
    178.08x = 37,769.91
  5. Step 5: Solve for x
    x = 37,769.91/178.08
  6. Step 6: Final answer
    x = 212.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.