Home / 1,581.20-2,371.64-485.47

Finding the Fourth Proportional to 1,581.20, 2,371.64 and 485.47

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Solution

The fourth proportional to 1,581.20, 2,371.64 and 485.47 is: 728.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.20 : 2,371.64 = 485.47 : x
  2. Step 2: Convert to fraction form
    1,581.20/2,371.64 = 485.47/x
  3. Step 3: Cross multiply
    1,581.20x = 2,371.64 × 485.47
  4. Step 4: Simplify right side
    1,581.20x = 1,151,360.07
  5. Step 5: Solve for x
    x = 1,151,360.07/1,581.20
  6. Step 6: Final answer
    x = 728.16

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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.