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Finding the Fourth Proportional to 1,372.86, 1,892.70 and 979.20

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Solution

The fourth proportional to 1,372.86, 1,892.70 and 979.20 is: 1,349.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.86 : 1,892.70 = 979.20 : x
  2. Step 2: Convert to fraction form
    1,372.86/1,892.70 = 979.20/x
  3. Step 3: Cross multiply
    1,372.86x = 1,892.70 × 979.20
  4. Step 4: Simplify right side
    1,372.86x = 1,853,331.84
  5. Step 5: Solve for x
    x = 1,853,331.84/1,372.86
  6. Step 6: Final answer
    x = 1,349.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.