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Finding the Fourth Proportional to 749.10, 1,124.19 and 316.38

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Solution

The fourth proportional to 749.10, 1,124.19 and 316.38 is: 474.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.10 : 1,124.19 = 316.38 : x
  2. Step 2: Convert to fraction form
    749.10/1,124.19 = 316.38/x
  3. Step 3: Cross multiply
    749.10x = 1,124.19 × 316.38
  4. Step 4: Simplify right side
    749.10x = 355,671.23
  5. Step 5: Solve for x
    x = 355,671.23/749.10
  6. Step 6: Final answer
    x = 474.80

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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.