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Finding the Fourth Proportional to 890.80, 1,334.40 and 505.60

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Solution

The fourth proportional to 890.80, 1,334.40 and 505.60 is: 757.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.80 : 1,334.40 = 505.60 : x
  2. Step 2: Convert to fraction form
    890.80/1,334.40 = 505.60/x
  3. Step 3: Cross multiply
    890.80x = 1,334.40 × 505.60
  4. Step 4: Simplify right side
    890.80x = 674,672.64
  5. Step 5: Solve for x
    x = 674,672.64/890.80
  6. Step 6: Final answer
    x = 757.38

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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.