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Finding the Fourth Proportional to 1,372.16, 2,058 and 398.40

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Solution

The fourth proportional to 1,372.16, 2,058 and 398.40 is: 597.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.16 : 2,058 = 398.40 : x
  2. Step 2: Convert to fraction form
    1,372.16/2,058 = 398.40/x
  3. Step 3: Cross multiply
    1,372.16x = 2,058 × 398.40
  4. Step 4: Simplify right side
    1,372.16x = 819,907.20
  5. Step 5: Solve for x
    x = 819,907.20/1,372.16
  6. Step 6: Final answer
    x = 597.53

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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.