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Finding the Fourth Proportional to 906.11, 1,353.55 and 644.05

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Solution

The fourth proportional to 906.11, 1,353.55 and 644.05 is: 962.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.11 : 1,353.55 = 644.05 : x
  2. Step 2: Convert to fraction form
    906.11/1,353.55 = 644.05/x
  3. Step 3: Cross multiply
    906.11x = 1,353.55 × 644.05
  4. Step 4: Simplify right side
    906.11x = 871,748.88
  5. Step 5: Solve for x
    x = 871,748.88/906.11
  6. Step 6: Final answer
    x = 962.08

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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.