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Finding the Fourth Proportional to 771.62, 1,062.30 and 668.04

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Solution

The fourth proportional to 771.62, 1,062.30 and 668.04 is: 919.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.62 : 1,062.30 = 668.04 : x
  2. Step 2: Convert to fraction form
    771.62/1,062.30 = 668.04/x
  3. Step 3: Cross multiply
    771.62x = 1,062.30 × 668.04
  4. Step 4: Simplify right side
    771.62x = 709,655.55
  5. Step 5: Solve for x
    x = 709,655.55/771.62
  6. Step 6: Final answer
    x = 919.70

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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.