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Finding the Fourth Proportional to 774.49, 1,068.72 and 479.65

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Solution

The fourth proportional to 774.49, 1,068.72 and 479.65 is: 661.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.49 : 1,068.72 = 479.65 : x
  2. Step 2: Convert to fraction form
    774.49/1,068.72 = 479.65/x
  3. Step 3: Cross multiply
    774.49x = 1,068.72 × 479.65
  4. Step 4: Simplify right side
    774.49x = 512,611.55
  5. Step 5: Solve for x
    x = 512,611.55/774.49
  6. Step 6: Final answer
    x = 661.87

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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.