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Finding the Fourth Proportional to 890.75, 1,229.74 and 618.39

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Solution

The fourth proportional to 890.75, 1,229.74 and 618.39 is: 853.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.75 : 1,229.74 = 618.39 : x
  2. Step 2: Convert to fraction form
    890.75/1,229.74 = 618.39/x
  3. Step 3: Cross multiply
    890.75x = 1,229.74 × 618.39
  4. Step 4: Simplify right side
    890.75x = 760,458.92
  5. Step 5: Solve for x
    x = 760,458.92/890.75
  6. Step 6: Final answer
    x = 853.73

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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.