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Finding the Fourth Proportional to 775.56, 1,168.64 and 641.56

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Solution

The fourth proportional to 775.56, 1,168.64 and 641.56 is: 966.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.56 : 1,168.64 = 641.56 : x
  2. Step 2: Convert to fraction form
    775.56/1,168.64 = 641.56/x
  3. Step 3: Cross multiply
    775.56x = 1,168.64 × 641.56
  4. Step 4: Simplify right side
    775.56x = 749,752.68
  5. Step 5: Solve for x
    x = 749,752.68/775.56
  6. Step 6: Final answer
    x = 966.72

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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.