Home / 1,320.42-1,979.96-442.62

Finding the Fourth Proportional to 1,320.42, 1,979.96 and 442.62

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Solution

The fourth proportional to 1,320.42, 1,979.96 and 442.62 is: 663.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.42 : 1,979.96 = 442.62 : x
  2. Step 2: Convert to fraction form
    1,320.42/1,979.96 = 442.62/x
  3. Step 3: Cross multiply
    1,320.42x = 1,979.96 × 442.62
  4. Step 4: Simplify right side
    1,320.42x = 876,369.90
  5. Step 5: Solve for x
    x = 876,369.90/1,320.42
  6. Step 6: Final answer
    x = 663.71

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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.