Home / 1,581.28-2,371.80-485.65

Finding the Fourth Proportional to 1,581.28, 2,371.80 and 485.65

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Solution

The fourth proportional to 1,581.28, 2,371.80 and 485.65 is: 728.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.28 : 2,371.80 = 485.65 : x
  2. Step 2: Convert to fraction form
    1,581.28/2,371.80 = 485.65/x
  3. Step 3: Cross multiply
    1,581.28x = 2,371.80 × 485.65
  4. Step 4: Simplify right side
    1,581.28x = 1,151,864.67
  5. Step 5: Solve for x
    x = 1,151,864.67/1,581.28
  6. Step 6: Final answer
    x = 728.44

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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.