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Finding the Fourth Proportional to 890.97, 1,228.56 and 611.25

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Solution

The fourth proportional to 890.97, 1,228.56 and 611.25 is: 842.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.97 : 1,228.56 = 611.25 : x
  2. Step 2: Convert to fraction form
    890.97/1,228.56 = 611.25/x
  3. Step 3: Cross multiply
    890.97x = 1,228.56 × 611.25
  4. Step 4: Simplify right side
    890.97x = 750,957.30
  5. Step 5: Solve for x
    x = 750,957.30/890.97
  6. Step 6: Final answer
    x = 842.85

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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.