Home / 1,058.20-1,587.28-408.56

Finding the Fourth Proportional to 1,058.20, 1,587.28 and 408.56

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Solution

The fourth proportional to 1,058.20, 1,587.28 and 408.56 is: 612.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,058.20 : 1,587.28 = 408.56 : x
  2. Step 2: Convert to fraction form
    1,058.20/1,587.28 = 408.56/x
  3. Step 3: Cross multiply
    1,058.20x = 1,587.28 × 408.56
  4. Step 4: Simplify right side
    1,058.20x = 648,499.12
  5. Step 5: Solve for x
    x = 648,499.12/1,058.20
  6. Step 6: Final answer
    x = 612.83

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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.