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Finding the Fourth Proportional to 771.56, 1,065.82 and 688.64

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Solution

The fourth proportional to 771.56, 1,065.82 and 688.64 is: 951.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.56 : 1,065.82 = 688.64 : x
  2. Step 2: Convert to fraction form
    771.56/1,065.82 = 688.64/x
  3. Step 3: Cross multiply
    771.56x = 1,065.82 × 688.64
  4. Step 4: Simplify right side
    771.56x = 733,966.28
  5. Step 5: Solve for x
    x = 733,966.28/771.56
  6. Step 6: Final answer
    x = 951.28

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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.