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Finding the Fourth Proportional to 775.16, 1,069.72 and 425.86

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Solution

The fourth proportional to 775.16, 1,069.72 and 425.86 is: 587.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.16 : 1,069.72 = 425.86 : x
  2. Step 2: Convert to fraction form
    775.16/1,069.72 = 425.86/x
  3. Step 3: Cross multiply
    775.16x = 1,069.72 × 425.86
  4. Step 4: Simplify right side
    775.16x = 455,550.96
  5. Step 5: Solve for x
    x = 455,550.96/775.16
  6. Step 6: Final answer
    x = 587.69

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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.