Home / 1,581.40-2,182.71-918.73

Finding the Fourth Proportional to 1,581.40, 2,182.71 and 918.73

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Solution

The fourth proportional to 1,581.40, 2,182.71 and 918.73 is: 1,268.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.40 : 2,182.71 = 918.73 : x
  2. Step 2: Convert to fraction form
    1,581.40/2,182.71 = 918.73/x
  3. Step 3: Cross multiply
    1,581.40x = 2,182.71 × 918.73
  4. Step 4: Simplify right side
    1,581.40x = 2,005,321.16
  5. Step 5: Solve for x
    x = 2,005,321.16/1,581.40
  6. Step 6: Final answer
    x = 1,268.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.