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Finding the Fourth Proportional to 320.51, 442.30 and 178.72

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Solution

The fourth proportional to 320.51, 442.30 and 178.72 is: 246.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.51 : 442.30 = 178.72 : x
  2. Step 2: Convert to fraction form
    320.51/442.30 = 178.72/x
  3. Step 3: Cross multiply
    320.51x = 442.30 × 178.72
  4. Step 4: Simplify right side
    320.51x = 79,049.13
  5. Step 5: Solve for x
    x = 79,049.13/320.51
  6. Step 6: Final answer
    x = 246.63

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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.