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Finding the Fourth Proportional to 1,027.63, 1,414.70 and 980.55

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Solution

The fourth proportional to 1,027.63, 1,414.70 and 980.55 is: 1,349.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,027.63 : 1,414.70 = 980.55 : x
  2. Step 2: Convert to fraction form
    1,027.63/1,414.70 = 980.55/x
  3. Step 3: Cross multiply
    1,027.63x = 1,414.70 × 980.55
  4. Step 4: Simplify right side
    1,027.63x = 1,387,182.86
  5. Step 5: Solve for x
    x = 1,387,182.86/1,027.63
  6. Step 6: Final answer
    x = 1,349.89

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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.