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Finding the Fourth Proportional to 774.90, 1,068.59 and 686.41

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Solution

The fourth proportional to 774.90, 1,068.59 and 686.41 is: 946.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.90 : 1,068.59 = 686.41 : x
  2. Step 2: Convert to fraction form
    774.90/1,068.59 = 686.41/x
  3. Step 3: Cross multiply
    774.90x = 1,068.59 × 686.41
  4. Step 4: Simplify right side
    774.90x = 733,489.91
  5. Step 5: Solve for x
    x = 733,489.91/774.90
  6. Step 6: Final answer
    x = 946.56

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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.