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Finding the Fourth Proportional to 774.94, 1,069.41 and 425.65

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Solution

The fourth proportional to 774.94, 1,069.41 and 425.65 is: 587.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.94 : 1,069.41 = 425.65 : x
  2. Step 2: Convert to fraction form
    774.94/1,069.41 = 425.65/x
  3. Step 3: Cross multiply
    774.94x = 1,069.41 × 425.65
  4. Step 4: Simplify right side
    774.94x = 455,193.29
  5. Step 5: Solve for x
    x = 455,193.29/774.94
  6. Step 6: Final answer
    x = 587.39

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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.