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Finding the Fourth Proportional to 316.72, 475.32 and 124.40

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Solution

The fourth proportional to 316.72, 475.32 and 124.40 is: 186.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.72 : 475.32 = 124.40 : x
  2. Step 2: Convert to fraction form
    316.72/475.32 = 124.40/x
  3. Step 3: Cross multiply
    316.72x = 475.32 × 124.40
  4. Step 4: Simplify right side
    316.72x = 59,129.81
  5. Step 5: Solve for x
    x = 59,129.81/316.72
  6. Step 6: Final answer
    x = 186.69

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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.