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Finding the Fourth Proportional to 701.66, 1,057.05 and 641.52

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Solution

The fourth proportional to 701.66, 1,057.05 and 641.52 is: 966.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    701.66 : 1,057.05 = 641.52 : x
  2. Step 2: Convert to fraction form
    701.66/1,057.05 = 641.52/x
  3. Step 3: Cross multiply
    701.66x = 1,057.05 × 641.52
  4. Step 4: Simplify right side
    701.66x = 678,118.72
  5. Step 5: Solve for x
    x = 678,118.72/701.66
  6. Step 6: Final answer
    x = 966.45

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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.