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Finding the Fourth Proportional to 775.45, 1,168.51 and 641.50

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Solution

The fourth proportional to 775.45, 1,168.51 and 641.50 is: 966.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.45 : 1,168.51 = 641.50 : x
  2. Step 2: Convert to fraction form
    775.45/1,168.51 = 641.50/x
  3. Step 3: Cross multiply
    775.45x = 1,168.51 × 641.50
  4. Step 4: Simplify right side
    775.45x = 749,595.84
  5. Step 5: Solve for x
    x = 749,595.84/775.45
  6. Step 6: Final answer
    x = 966.66

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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.