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Finding the Fourth Proportional to 775.68, 1,168.85 and 641.72

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Solution

The fourth proportional to 775.68, 1,168.85 and 641.72 is: 966.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.68 : 1,168.85 = 641.72 : x
  2. Step 2: Convert to fraction form
    775.68/1,168.85 = 641.72/x
  3. Step 3: Cross multiply
    775.68x = 1,168.85 × 641.72
  4. Step 4: Simplify right side
    775.68x = 750,071.21
  5. Step 5: Solve for x
    x = 750,071.21/775.68
  6. Step 6: Final answer
    x = 966.99

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Double scale
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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.