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Finding the Fourth Proportional to 408.58, 612.86 and 100.42

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Solution

The fourth proportional to 408.58, 612.86 and 100.42 is: 150.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.58 : 612.86 = 100.42 : x
  2. Step 2: Convert to fraction form
    408.58/612.86 = 100.42/x
  3. Step 3: Cross multiply
    408.58x = 612.86 × 100.42
  4. Step 4: Simplify right side
    408.58x = 61,541.37
  5. Step 5: Solve for x
    x = 61,541.37/408.58
  6. Step 6: Final answer
    x = 150.62

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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.