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Finding the Fourth Proportional to 3,486.78, 5,230.43 and 889.70

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Solution

The fourth proportional to 3,486.78, 5,230.43 and 889.70 is: 1,334.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,486.78 : 5,230.43 = 889.70 : x
  2. Step 2: Convert to fraction form
    3,486.78/5,230.43 = 889.70/x
  3. Step 3: Cross multiply
    3,486.78x = 5,230.43 × 889.70
  4. Step 4: Simplify right side
    3,486.78x = 4,653,482.97
  5. Step 5: Solve for x
    x = 4,653,482.97/3,486.78
  6. Step 6: Final answer
    x = 1,334.61

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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.