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Finding the Fourth Proportional to 774.98, 1,069.44 and 425.66

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Solution

The fourth proportional to 774.98, 1,069.44 and 425.66 is: 587.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.98 : 1,069.44 = 425.66 : x
  2. Step 2: Convert to fraction form
    774.98/1,069.44 = 425.66/x
  3. Step 3: Cross multiply
    774.98x = 1,069.44 × 425.66
  4. Step 4: Simplify right side
    774.98x = 455,217.83
  5. Step 5: Solve for x
    x = 455,217.83/774.98
  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.