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Finding the Fourth Proportional to 774.76, 1,167.47 and 640.81

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Solution

The fourth proportional to 774.76, 1,167.47 and 640.81 is: 965.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.76 : 1,167.47 = 640.81 : x
  2. Step 2: Convert to fraction form
    774.76/1,167.47 = 640.81/x
  3. Step 3: Cross multiply
    774.76x = 1,167.47 × 640.81
  4. Step 4: Simplify right side
    774.76x = 748,126.45
  5. Step 5: Solve for x
    x = 748,126.45/774.76
  6. Step 6: Final answer
    x = 965.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.