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Finding the Fourth Proportional to 890.84, 1,228.42 and 611.48

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Solution

The fourth proportional to 890.84, 1,228.42 and 611.48 is: 843.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.84 : 1,228.42 = 611.48 : x
  2. Step 2: Convert to fraction form
    890.84/1,228.42 = 611.48/x
  3. Step 3: Cross multiply
    890.84x = 1,228.42 × 611.48
  4. Step 4: Simplify right side
    890.84x = 751,154.66
  5. Step 5: Solve for x
    x = 751,154.66/890.84
  6. Step 6: Final answer
    x = 843.20

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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.