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Finding the Fourth Proportional to 774.20, 1,068.45 and 479.57

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Solution

The fourth proportional to 774.20, 1,068.45 and 479.57 is: 661.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.20 : 1,068.45 = 479.57 : x
  2. Step 2: Convert to fraction form
    774.20/1,068.45 = 479.57/x
  3. Step 3: Cross multiply
    774.20x = 1,068.45 × 479.57
  4. Step 4: Simplify right side
    774.20x = 512,396.57
  5. Step 5: Solve for x
    x = 512,396.57/774.20
  6. Step 6: Final answer
    x = 661.84

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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.