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Finding the Fourth Proportional to 1,145.80, 1,581.11 and 673.76

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Solution

The fourth proportional to 1,145.80, 1,581.11 and 673.76 is: 929.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.80 : 1,581.11 = 673.76 : x
  2. Step 2: Convert to fraction form
    1,145.80/1,581.11 = 673.76/x
  3. Step 3: Cross multiply
    1,145.80x = 1,581.11 × 673.76
  4. Step 4: Simplify right side
    1,145.80x = 1,065,288.67
  5. Step 5: Solve for x
    x = 1,065,288.67/1,145.80
  6. Step 6: Final answer
    x = 929.73

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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.