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Finding the Fourth Proportional to 318.78, 478.35 and 156.51

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Solution

The fourth proportional to 318.78, 478.35 and 156.51 is: 234.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.78 : 478.35 = 156.51 : x
  2. Step 2: Convert to fraction form
    318.78/478.35 = 156.51/x
  3. Step 3: Cross multiply
    318.78x = 478.35 × 156.51
  4. Step 4: Simplify right side
    318.78x = 74,866.56
  5. Step 5: Solve for x
    x = 74,866.56/318.78
  6. Step 6: Final answer
    x = 234.85

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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.