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Finding the Fourth Proportional to 889.70, 1,227.90 and 540.39

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Solution

The fourth proportional to 889.70, 1,227.90 and 540.39 is: 745.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.70 : 1,227.90 = 540.39 : x
  2. Step 2: Convert to fraction form
    889.70/1,227.90 = 540.39/x
  3. Step 3: Cross multiply
    889.70x = 1,227.90 × 540.39
  4. Step 4: Simplify right side
    889.70x = 663,544.88
  5. Step 5: Solve for x
    x = 663,544.88/889.70
  6. Step 6: Final answer
    x = 745.81

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1.5x scale

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.