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Finding the Fourth Proportional to 318.58, 478.02 and 123.64

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Solution

The fourth proportional to 318.58, 478.02 and 123.64 is: 185.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.58 : 478.02 = 123.64 : x
  2. Step 2: Convert to fraction form
    318.58/478.02 = 123.64/x
  3. Step 3: Cross multiply
    318.58x = 478.02 × 123.64
  4. Step 4: Simplify right side
    318.58x = 59,102.39
  5. Step 5: Solve for x
    x = 59,102.39/318.58
  6. Step 6: Final answer
    x = 185.52

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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.