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Finding the Fourth Proportional to 318.93, 478.40 and 99.55

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Solution

The fourth proportional to 318.93, 478.40 and 99.55 is: 149.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.93 : 478.40 = 99.55 : x
  2. Step 2: Convert to fraction form
    318.93/478.40 = 99.55/x
  3. Step 3: Cross multiply
    318.93x = 478.40 × 99.55
  4. Step 4: Simplify right side
    318.93x = 47,624.82
  5. Step 5: Solve for x
    x = 47,624.82/318.93
  6. Step 6: Final answer
    x = 149.33

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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.