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Finding the Fourth Proportional to 1,319.77, 1,980.87 and 670.96

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Solution

The fourth proportional to 1,319.77, 1,980.87 and 670.96 is: 1,007.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.77 : 1,980.87 = 670.96 : x
  2. Step 2: Convert to fraction form
    1,319.77/1,980.87 = 670.96/x
  3. Step 3: Cross multiply
    1,319.77x = 1,980.87 × 670.96
  4. Step 4: Simplify right side
    1,319.77x = 1,329,084.54
  5. Step 5: Solve for x
    x = 1,329,084.54/1,319.77
  6. Step 6: Final answer
    x = 1,007.06

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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.