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Finding the Fourth Proportional to 641.26, 954.20 and 639.10

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Solution

The fourth proportional to 641.26, 954.20 and 639.10 is: 950.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.26 : 954.20 = 639.10 : x
  2. Step 2: Convert to fraction form
    641.26/954.20 = 639.10/x
  3. Step 3: Cross multiply
    641.26x = 954.20 × 639.10
  4. Step 4: Simplify right side
    641.26x = 609,829.22
  5. Step 5: Solve for x
    x = 609,829.22/641.26
  6. Step 6: Final answer
    x = 950.99

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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.