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Finding the Fourth Proportional to 890.80, 1,334.40 and 617.20

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Solution

The fourth proportional to 890.80, 1,334.40 and 617.20 is: 924.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.80 : 1,334.40 = 617.20 : x
  2. Step 2: Convert to fraction form
    890.80/1,334.40 = 617.20/x
  3. Step 3: Cross multiply
    890.80x = 1,334.40 × 617.20
  4. Step 4: Simplify right side
    890.80x = 823,591.68
  5. Step 5: Solve for x
    x = 823,591.68/890.80
  6. Step 6: Final answer
    x = 924.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.