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Finding the Fourth Proportional to 671.66, 1,000.41 and 641.68

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Solution

The fourth proportional to 671.66, 1,000.41 and 641.68 is: 955.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.66 : 1,000.41 = 641.68 : x
  2. Step 2: Convert to fraction form
    671.66/1,000.41 = 641.68/x
  3. Step 3: Cross multiply
    671.66x = 1,000.41 × 641.68
  4. Step 4: Simplify right side
    671.66x = 641,943.09
  5. Step 5: Solve for x
    x = 641,943.09/671.66
  6. Step 6: Final answer
    x = 955.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.