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Finding the Fourth Proportional to 1,581.36, 2,182.09 and 918.12

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Solution

The fourth proportional to 1,581.36, 2,182.09 and 918.12 is: 1,266.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.36 : 2,182.09 = 918.12 : x
  2. Step 2: Convert to fraction form
    1,581.36/2,182.09 = 918.12/x
  3. Step 3: Cross multiply
    1,581.36x = 2,182.09 × 918.12
  4. Step 4: Simplify right side
    1,581.36x = 2,003,420.47
  5. Step 5: Solve for x
    x = 2,003,420.47/1,581.36
  6. Step 6: Final answer
    x = 1,266.90

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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.