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Finding the Fourth Proportional to 900.20, 1,350.30 and 849.80

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Solution

The fourth proportional to 900.20, 1,350.30 and 849.80 is: 1,274.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.20 : 1,350.30 = 849.80 : x
  2. Step 2: Convert to fraction form
    900.20/1,350.30 = 849.80/x
  3. Step 3: Cross multiply
    900.20x = 1,350.30 × 849.80
  4. Step 4: Simplify right side
    900.20x = 1,147,484.94
  5. Step 5: Solve for x
    x = 1,147,484.94/900.20
  6. Step 6: Final answer
    x = 1,274.70

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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.