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Finding the Fourth Proportional to 1,058.21, 1,587.01 and 408.79

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Solution

The fourth proportional to 1,058.21, 1,587.01 and 408.79 is: 613.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,058.21 : 1,587.01 = 408.79 : x
  2. Step 2: Convert to fraction form
    1,058.21/1,587.01 = 408.79/x
  3. Step 3: Cross multiply
    1,058.21x = 1,587.01 × 408.79
  4. Step 4: Simplify right side
    1,058.21x = 648,751.77
  5. Step 5: Solve for x
    x = 648,751.77/1,058.21
  6. Step 6: Final answer
    x = 613.07

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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.