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Finding the Fourth Proportional to 1,581.76, 2,182.92 and 918.47

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Solution

The fourth proportional to 1,581.76, 2,182.92 and 918.47 is: 1,267.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.76 : 2,182.92 = 918.47 : x
  2. Step 2: Convert to fraction form
    1,581.76/2,182.92 = 918.47/x
  3. Step 3: Cross multiply
    1,581.76x = 2,182.92 × 918.47
  4. Step 4: Simplify right side
    1,581.76x = 2,004,948.55
  5. Step 5: Solve for x
    x = 2,004,948.55/1,581.76
  6. Step 6: Final answer
    x = 1,267.54

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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.