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Finding the Fourth Proportional to 890.50, 1,330.34 and 744.70

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Solution

The fourth proportional to 890.50, 1,330.34 and 744.70 is: 1,112.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.50 : 1,330.34 = 744.70 : x
  2. Step 2: Convert to fraction form
    890.50/1,330.34 = 744.70/x
  3. Step 3: Cross multiply
    890.50x = 1,330.34 × 744.70
  4. Step 4: Simplify right side
    890.50x = 990,704.20
  5. Step 5: Solve for x
    x = 990,704.20/890.50
  6. Step 6: Final answer
    x = 1,112.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.