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Finding the Fourth Proportional to 749.12, 1,124.15 and 316.28

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Solution

The fourth proportional to 749.12, 1,124.15 and 316.28 is: 474.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.12 : 1,124.15 = 316.28 : x
  2. Step 2: Convert to fraction form
    749.12/1,124.15 = 316.28/x
  3. Step 3: Cross multiply
    749.12x = 1,124.15 × 316.28
  4. Step 4: Simplify right side
    749.12x = 355,538.96
  5. Step 5: Solve for x
    x = 355,538.96/749.12
  6. Step 6: Final answer
    x = 474.61

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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.