Home / 1,320.65-1,979.60-442.49

Finding the Fourth Proportional to 1,320.65, 1,979.60 and 442.49

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Solution

The fourth proportional to 1,320.65, 1,979.60 and 442.49 is: 663.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.65 : 1,979.60 = 442.49 : x
  2. Step 2: Convert to fraction form
    1,320.65/1,979.60 = 442.49/x
  3. Step 3: Cross multiply
    1,320.65x = 1,979.60 × 442.49
  4. Step 4: Simplify right side
    1,320.65x = 875,953.20
  5. Step 5: Solve for x
    x = 875,953.20/1,320.65
  6. Step 6: Final answer
    x = 663.27

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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.