Home / 1,320.23-1,979.69-442.42

Finding the Fourth Proportional to 1,320.23, 1,979.69 and 442.42

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Solution

The fourth proportional to 1,320.23, 1,979.69 and 442.42 is: 663.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.23 : 1,979.69 = 442.42 : x
  2. Step 2: Convert to fraction form
    1,320.23/1,979.69 = 442.42/x
  3. Step 3: Cross multiply
    1,320.23x = 1,979.69 × 442.42
  4. Step 4: Simplify right side
    1,320.23x = 875,847.29
  5. Step 5: Solve for x
    x = 875,847.29/1,320.23
  6. Step 6: Final answer
    x = 663.40

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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.