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Finding the Fourth Proportional to 641.60, 962.88 and 435.68

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Solution

The fourth proportional to 641.60, 962.88 and 435.68 is: 653.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.60 : 962.88 = 435.68 : x
  2. Step 2: Convert to fraction form
    641.60/962.88 = 435.68/x
  3. Step 3: Cross multiply
    641.60x = 962.88 × 435.68
  4. Step 4: Simplify right side
    641.60x = 419,507.56
  5. Step 5: Solve for x
    x = 419,507.56/641.60
  6. Step 6: Final answer
    x = 653.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.