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Finding the Fourth Proportional to 1,319.75, 1,980.33 and 670.55

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Solution

The fourth proportional to 1,319.75, 1,980.33 and 670.55 is: 1,006.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.75 : 1,980.33 = 670.55 : x
  2. Step 2: Convert to fraction form
    1,319.75/1,980.33 = 670.55/x
  3. Step 3: Cross multiply
    1,319.75x = 1,980.33 × 670.55
  4. Step 4: Simplify right side
    1,319.75x = 1,327,910.28
  5. Step 5: Solve for x
    x = 1,327,910.28/1,319.75
  6. Step 6: Final answer
    x = 1,006.18

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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.