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Finding the Fourth Proportional to 318.99, 478.43 and 102.52

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Solution

The fourth proportional to 318.99, 478.43 and 102.52 is: 153.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.99 : 478.43 = 102.52 : x
  2. Step 2: Convert to fraction form
    318.99/478.43 = 102.52/x
  3. Step 3: Cross multiply
    318.99x = 478.43 × 102.52
  4. Step 4: Simplify right side
    318.99x = 49,046.71
  5. Step 5: Solve for x
    x = 49,046.71/318.99
  6. Step 6: Final answer
    x = 153.76

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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.