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Finding the Fourth Proportional to 890.46, 1,231.47 and 779.76

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Solution

The fourth proportional to 890.46, 1,231.47 and 779.76 is: 1,078.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.46 : 1,231.47 = 779.76 : x
  2. Step 2: Convert to fraction form
    890.46/1,231.47 = 779.76/x
  3. Step 3: Cross multiply
    890.46x = 1,231.47 × 779.76
  4. Step 4: Simplify right side
    890.46x = 960,251.05
  5. Step 5: Solve for x
    x = 960,251.05/890.46
  6. Step 6: Final answer
    x = 1,078.38

Related Problems

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Double scale
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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.