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Finding the Fourth Proportional to 749.46, 1,124.20 and 316.30

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Solution

The fourth proportional to 749.46, 1,124.20 and 316.30 is: 474.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.46 : 1,124.20 = 316.30 : x
  2. Step 2: Convert to fraction form
    749.46/1,124.20 = 316.30/x
  3. Step 3: Cross multiply
    749.46x = 1,124.20 × 316.30
  4. Step 4: Simplify right side
    749.46x = 355,584.46
  5. Step 5: Solve for x
    x = 355,584.46/749.46
  6. Step 6: Final answer
    x = 474.45

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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.