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Finding the Fourth Proportional to 901.55, 1,353.20 and 641.86

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Solution

The fourth proportional to 901.55, 1,353.20 and 641.86 is: 963.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.55 : 1,353.20 = 641.86 : x
  2. Step 2: Convert to fraction form
    901.55/1,353.20 = 641.86/x
  3. Step 3: Cross multiply
    901.55x = 1,353.20 × 641.86
  4. Step 4: Simplify right side
    901.55x = 868,564.95
  5. Step 5: Solve for x
    x = 868,564.95/901.55
  6. Step 6: Final answer
    x = 963.41

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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.