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Finding the Fourth Proportional to 775.72, 1,069.50 and 635.32

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Solution

The fourth proportional to 775.72, 1,069.50 and 635.32 is: 875.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.72 : 1,069.50 = 635.32 : x
  2. Step 2: Convert to fraction form
    775.72/1,069.50 = 635.32/x
  3. Step 3: Cross multiply
    775.72x = 1,069.50 × 635.32
  4. Step 4: Simplify right side
    775.72x = 679,474.74
  5. Step 5: Solve for x
    x = 679,474.74/775.72
  6. Step 6: Final answer
    x = 875.93

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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.