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Finding the Fourth Proportional to 3,488.78, 5,233.43 and 891.70

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Solution

The fourth proportional to 3,488.78, 5,233.43 and 891.70 is: 1,337.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,488.78 : 5,233.43 = 891.70 : x
  2. Step 2: Convert to fraction form
    3,488.78/5,233.43 = 891.70/x
  3. Step 3: Cross multiply
    3,488.78x = 5,233.43 × 891.70
  4. Step 4: Simplify right side
    3,488.78x = 4,666,649.53
  5. Step 5: Solve for x
    x = 4,666,649.53/3,488.78
  6. Step 6: Final answer
    x = 1,337.62

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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.