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Finding the Fourth Proportional to 774.88, 1,069.36 and 425.58

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Solution

The fourth proportional to 774.88, 1,069.36 and 425.58 is: 587.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.88 : 1,069.36 = 425.58 : x
  2. Step 2: Convert to fraction form
    774.88/1,069.36 = 425.58/x
  3. Step 3: Cross multiply
    774.88x = 1,069.36 × 425.58
  4. Step 4: Simplify right side
    774.88x = 455,098.23
  5. Step 5: Solve for x
    x = 455,098.23/774.88
  6. Step 6: Final answer
    x = 587.31

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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.