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Finding the Fourth Proportional to 774.11, 1,166.40 and 640.16

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Solution

The fourth proportional to 774.11, 1,166.40 and 640.16 is: 964.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.11 : 1,166.40 = 640.16 : x
  2. Step 2: Convert to fraction form
    774.11/1,166.40 = 640.16/x
  3. Step 3: Cross multiply
    774.11x = 1,166.40 × 640.16
  4. Step 4: Simplify right side
    774.11x = 746,682.62
  5. Step 5: Solve for x
    x = 746,682.62/774.11
  6. Step 6: Final answer
    x = 964.57

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1.5x scale

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.