Home / 1,581.21-2,371.65-485.58

Finding the Fourth Proportional to 1,581.21, 2,371.65 and 485.58

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Solution

The fourth proportional to 1,581.21, 2,371.65 and 485.58 is: 728.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.21 : 2,371.65 = 485.58 : x
  2. Step 2: Convert to fraction form
    1,581.21/2,371.65 = 485.58/x
  3. Step 3: Cross multiply
    1,581.21x = 2,371.65 × 485.58
  4. Step 4: Simplify right side
    1,581.21x = 1,151,625.81
  5. Step 5: Solve for x
    x = 1,151,625.81/1,581.21
  6. Step 6: Final answer
    x = 728.32

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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.