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Finding the Fourth Proportional to 774.85, 1,069.35 and 480.13

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Solution

The fourth proportional to 774.85, 1,069.35 and 480.13 is: 662.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.85 : 1,069.35 = 480.13 : x
  2. Step 2: Convert to fraction form
    774.85/1,069.35 = 480.13/x
  3. Step 3: Cross multiply
    774.85x = 1,069.35 × 480.13
  4. Step 4: Simplify right side
    774.85x = 513,427.02
  5. Step 5: Solve for x
    x = 513,427.02/774.85
  6. Step 6: Final answer
    x = 662.61

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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.