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Finding the Fourth Proportional to 641.41, 885 and 631.69

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Solution

The fourth proportional to 641.41, 885 and 631.69 is: 871.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.41 : 885 = 631.69 : x
  2. Step 2: Convert to fraction form
    641.41/885 = 631.69/x
  3. Step 3: Cross multiply
    641.41x = 885 × 631.69
  4. Step 4: Simplify right side
    641.41x = 559,045.65
  5. Step 5: Solve for x
    x = 559,045.65/641.41
  6. Step 6: Final answer
    x = 871.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.