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Finding the Fourth Proportional to 1,373.40, 2,058.89 and 643.86

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Solution

The fourth proportional to 1,373.40, 2,058.89 and 643.86 is: 965.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,373.40 : 2,058.89 = 643.86 : x
  2. Step 2: Convert to fraction form
    1,373.40/2,058.89 = 643.86/x
  3. Step 3: Cross multiply
    1,373.40x = 2,058.89 × 643.86
  4. Step 4: Simplify right side
    1,373.40x = 1,325,633.70
  5. Step 5: Solve for x
    x = 1,325,633.70/1,373.40
  6. Step 6: Final answer
    x = 965.22

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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.