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Finding the Fourth Proportional to 412.40, 618.74 and 247.86

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Solution

The fourth proportional to 412.40, 618.74 and 247.86 is: 371.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.40 : 618.74 = 247.86 : x
  2. Step 2: Convert to fraction form
    412.40/618.74 = 247.86/x
  3. Step 3: Cross multiply
    412.40x = 618.74 × 247.86
  4. Step 4: Simplify right side
    412.40x = 153,360.90
  5. Step 5: Solve for x
    x = 153,360.90/412.40
  6. Step 6: Final answer
    x = 371.87

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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.