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Finding the Fourth Proportional to 1,129.33, 1,695.82 and 851.70

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Solution

The fourth proportional to 1,129.33, 1,695.82 and 851.70 is: 1,278.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.33 : 1,695.82 = 851.70 : x
  2. Step 2: Convert to fraction form
    1,129.33/1,695.82 = 851.70/x
  3. Step 3: Cross multiply
    1,129.33x = 1,695.82 × 851.70
  4. Step 4: Simplify right side
    1,129.33x = 1,444,329.89
  5. Step 5: Solve for x
    x = 1,444,329.89/1,129.33
  6. Step 6: Final answer
    x = 1,278.93

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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.