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Finding the Fourth Proportional to 1,319.78, 1,980.33 and 881.27

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Solution

The fourth proportional to 1,319.78, 1,980.33 and 881.27 is: 1,322.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.78 : 1,980.33 = 881.27 : x
  2. Step 2: Convert to fraction form
    1,319.78/1,980.33 = 881.27/x
  3. Step 3: Cross multiply
    1,319.78x = 1,980.33 × 881.27
  4. Step 4: Simplify right side
    1,319.78x = 1,745,205.42
  5. Step 5: Solve for x
    x = 1,745,205.42/1,319.78
  6. Step 6: Final answer
    x = 1,322.35

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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.