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Finding the Fourth Proportional to 1,058.12, 1,587.42 and 408.86

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Solution

The fourth proportional to 1,058.12, 1,587.42 and 408.86 is: 613.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,058.12 : 1,587.42 = 408.86 : x
  2. Step 2: Convert to fraction form
    1,058.12/1,587.42 = 408.86/x
  3. Step 3: Cross multiply
    1,058.12x = 1,587.42 × 408.86
  4. Step 4: Simplify right side
    1,058.12x = 649,032.54
  5. Step 5: Solve for x
    x = 649,032.54/1,058.12
  6. Step 6: Final answer
    x = 613.38

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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.