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Finding the Fourth Proportional to 178.40, 245.76 and 120.08

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Solution

The fourth proportional to 178.40, 245.76 and 120.08 is: 165.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.40 : 245.76 = 120.08 : x
  2. Step 2: Convert to fraction form
    178.40/245.76 = 120.08/x
  3. Step 3: Cross multiply
    178.40x = 245.76 × 120.08
  4. Step 4: Simplify right side
    178.40x = 29,510.86
  5. Step 5: Solve for x
    x = 29,510.86/178.40
  6. Step 6: Final answer
    x = 165.42

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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.