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Finding the Fourth Proportional to 776.70, 1,071.87 and 422.65

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Solution

The fourth proportional to 776.70, 1,071.87 and 422.65 is: 583.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.70 : 1,071.87 = 422.65 : x
  2. Step 2: Convert to fraction form
    776.70/1,071.87 = 422.65/x
  3. Step 3: Cross multiply
    776.70x = 1,071.87 × 422.65
  4. Step 4: Simplify right side
    776.70x = 453,023.18
  5. Step 5: Solve for x
    x = 453,023.18/776.70
  6. Step 6: Final answer
    x = 583.27

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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.