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Finding the Fourth Proportional to 890.25, 1,228.14 and 610.80

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Solution

The fourth proportional to 890.25, 1,228.14 and 610.80 is: 842.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.25 : 1,228.14 = 610.80 : x
  2. Step 2: Convert to fraction form
    890.25/1,228.14 = 610.80/x
  3. Step 3: Cross multiply
    890.25x = 1,228.14 × 610.80
  4. Step 4: Simplify right side
    890.25x = 750,147.91
  5. Step 5: Solve for x
    x = 750,147.91/890.25
  6. Step 6: Final answer
    x = 842.63

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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.