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Finding the Fourth Proportional to 319.32, 478.56 and 126.72

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Solution

The fourth proportional to 319.32, 478.56 and 126.72 is: 189.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.32 : 478.56 = 126.72 : x
  2. Step 2: Convert to fraction form
    319.32/478.56 = 126.72/x
  3. Step 3: Cross multiply
    319.32x = 478.56 × 126.72
  4. Step 4: Simplify right side
    319.32x = 60,643.12
  5. Step 5: Solve for x
    x = 60,643.12/319.32
  6. Step 6: Final answer
    x = 189.91

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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.