Home / 1,319.89-1,979.63-442.39

Finding the Fourth Proportional to 1,319.89, 1,979.63 and 442.39

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Solution

The fourth proportional to 1,319.89, 1,979.63 and 442.39 is: 663.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.89 : 1,979.63 = 442.39 : x
  2. Step 2: Convert to fraction form
    1,319.89/1,979.63 = 442.39/x
  3. Step 3: Cross multiply
    1,319.89x = 1,979.63 × 442.39
  4. Step 4: Simplify right side
    1,319.89x = 875,758.62
  5. Step 5: Solve for x
    x = 875,758.62/1,319.89
  6. Step 6: Final answer
    x = 663.51

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1.5x scale

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.