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Finding the Fourth Proportional to 1,058.73, 1,587.57 and 391.34

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Solution

The fourth proportional to 1,058.73, 1,587.57 and 391.34 is: 586.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,058.73 : 1,587.57 = 391.34 : x
  2. Step 2: Convert to fraction form
    1,058.73/1,587.57 = 391.34/x
  3. Step 3: Cross multiply
    1,058.73x = 1,587.57 × 391.34
  4. Step 4: Simplify right side
    1,058.73x = 621,279.64
  5. Step 5: Solve for x
    x = 621,279.64/1,058.73
  6. Step 6: Final answer
    x = 586.82

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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.