Home / 1,581.25-2,181.96-918.24

Finding the Fourth Proportional to 1,581.25, 2,181.96 and 918.24

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Solution

The fourth proportional to 1,581.25, 2,181.96 and 918.24 is: 1,267.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.25 : 2,181.96 = 918.24 : x
  2. Step 2: Convert to fraction form
    1,581.25/2,181.96 = 918.24/x
  3. Step 3: Cross multiply
    1,581.25x = 2,181.96 × 918.24
  4. Step 4: Simplify right side
    1,581.25x = 2,003,562.95
  5. Step 5: Solve for x
    x = 2,003,562.95/1,581.25
  6. Step 6: Final answer
    x = 1,267.08

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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.