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Finding the Fourth Proportional to 743.46, 1,115.19 and 310.11

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Solution

The fourth proportional to 743.46, 1,115.19 and 310.11 is: 465.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.46 : 1,115.19 = 310.11 : x
  2. Step 2: Convert to fraction form
    743.46/1,115.19 = 310.11/x
  3. Step 3: Cross multiply
    743.46x = 1,115.19 × 310.11
  4. Step 4: Simplify right side
    743.46x = 345,831.57
  5. Step 5: Solve for x
    x = 345,831.57/743.46
  6. Step 6: Final answer
    x = 465.17

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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.