Home / 1,319.85-1,979.11-442.05

Finding the Fourth Proportional to 1,319.85, 1,979.11 and 442.05

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Solution

The fourth proportional to 1,319.85, 1,979.11 and 442.05 is: 662.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.85 : 1,979.11 = 442.05 : x
  2. Step 2: Convert to fraction form
    1,319.85/1,979.11 = 442.05/x
  3. Step 3: Cross multiply
    1,319.85x = 1,979.11 × 442.05
  4. Step 4: Simplify right side
    1,319.85x = 874,865.58
  5. Step 5: Solve for x
    x = 874,865.58/1,319.85
  6. Step 6: Final answer
    x = 662.85

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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.