Home / 1,319.75-1,979.41-442.64

Finding the Fourth Proportional to 1,319.75, 1,979.41 and 442.64

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Solution

The fourth proportional to 1,319.75, 1,979.41 and 442.64 is: 663.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.75 : 1,979.41 = 442.64 : x
  2. Step 2: Convert to fraction form
    1,319.75/1,979.41 = 442.64/x
  3. Step 3: Cross multiply
    1,319.75x = 1,979.41 × 442.64
  4. Step 4: Simplify right side
    1,319.75x = 876,166.04
  5. Step 5: Solve for x
    x = 876,166.04/1,319.75
  6. Step 6: Final answer
    x = 663.89

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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.