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Finding the Fourth Proportional to 1,255.02, 1,731.66 and 789

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Solution

The fourth proportional to 1,255.02, 1,731.66 and 789 is: 1,088.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.02 : 1,731.66 = 789 : x
  2. Step 2: Convert to fraction form
    1,255.02/1,731.66 = 789/x
  3. Step 3: Cross multiply
    1,255.02x = 1,731.66 × 789
  4. Step 4: Simplify right side
    1,255.02x = 1,366,279.74
  5. Step 5: Solve for x
    x = 1,366,279.74/1,255.02
  6. Step 6: Final answer
    x = 1,088.65

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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.