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Finding the Fourth Proportional to 412.24, 618.48 and 258.40

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Solution

The fourth proportional to 412.24, 618.48 and 258.40 is: 387.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.24 : 618.48 = 258.40 : x
  2. Step 2: Convert to fraction form
    412.24/618.48 = 258.40/x
  3. Step 3: Cross multiply
    412.24x = 618.48 × 258.40
  4. Step 4: Simplify right side
    412.24x = 159,815.23
  5. Step 5: Solve for x
    x = 159,815.23/412.24
  6. Step 6: Final answer
    x = 387.68

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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.