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Finding the Fourth Proportional to 1,159.81, 1,738.50 and 851.20

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Solution

The fourth proportional to 1,159.81, 1,738.50 and 851.20 is: 1,275.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159.81 : 1,738.50 = 851.20 : x
  2. Step 2: Convert to fraction form
    1,159.81/1,738.50 = 851.20/x
  3. Step 3: Cross multiply
    1,159.81x = 1,738.50 × 851.20
  4. Step 4: Simplify right side
    1,159.81x = 1,479,811.20
  5. Step 5: Solve for x
    x = 1,479,811.20/1,159.81
  6. Step 6: Final answer
    x = 1,275.91

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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.