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Finding the Fourth Proportional to 1,151.65, 1,728.10 and 879.49

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Solution

The fourth proportional to 1,151.65, 1,728.10 and 879.49 is: 1,319.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.65 : 1,728.10 = 879.49 : x
  2. Step 2: Convert to fraction form
    1,151.65/1,728.10 = 879.49/x
  3. Step 3: Cross multiply
    1,151.65x = 1,728.10 × 879.49
  4. Step 4: Simplify right side
    1,151.65x = 1,519,849.93
  5. Step 5: Solve for x
    x = 1,519,849.93/1,151.65
  6. Step 6: Final answer
    x = 1,319.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.