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Finding the Fourth Proportional to 775.94, 1,069.56 and 609.90

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Solution

The fourth proportional to 775.94, 1,069.56 and 609.90 is: 840.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.94 : 1,069.56 = 609.90 : x
  2. Step 2: Convert to fraction form
    775.94/1,069.56 = 609.90/x
  3. Step 3: Cross multiply
    775.94x = 1,069.56 × 609.90
  4. Step 4: Simplify right side
    775.94x = 652,324.64
  5. Step 5: Solve for x
    x = 652,324.64/775.94
  6. Step 6: Final answer
    x = 840.69

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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.