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Finding the Fourth Proportional to 890.12, 1,228.12 and 540.56

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Solution

The fourth proportional to 890.12, 1,228.12 and 540.56 is: 745.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.12 : 1,228.12 = 540.56 : x
  2. Step 2: Convert to fraction form
    890.12/1,228.12 = 540.56/x
  3. Step 3: Cross multiply
    890.12x = 1,228.12 × 540.56
  4. Step 4: Simplify right side
    890.12x = 663,865.06
  5. Step 5: Solve for x
    x = 663,865.06/890.12
  6. Step 6: Final answer
    x = 745.82

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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.