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Finding the Fourth Proportional to 408.63, 612.93 and 100.48

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Solution

The fourth proportional to 408.63, 612.93 and 100.48 is: 150.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.63 : 612.93 = 100.48 : x
  2. Step 2: Convert to fraction form
    408.63/612.93 = 100.48/x
  3. Step 3: Cross multiply
    408.63x = 612.93 × 100.48
  4. Step 4: Simplify right side
    408.63x = 61,587.21
  5. Step 5: Solve for x
    x = 61,587.21/408.63
  6. Step 6: Final answer
    x = 150.72

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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.