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Finding the Fourth Proportional to 412.76, 618.72 and 258.68

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Solution

The fourth proportional to 412.76, 618.72 and 258.68 is: 387.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.76 : 618.72 = 258.68 : x
  2. Step 2: Convert to fraction form
    412.76/618.72 = 258.68/x
  3. Step 3: Cross multiply
    412.76x = 618.72 × 258.68
  4. Step 4: Simplify right side
    412.76x = 160,050.49
  5. Step 5: Solve for x
    x = 160,050.49/412.76
  6. Step 6: Final answer
    x = 387.76

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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.