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Finding the Fourth Proportional to 900.82, 1,243.15 and 528.02

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Solution

The fourth proportional to 900.82, 1,243.15 and 528.02 is: 728.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.82 : 1,243.15 = 528.02 : x
  2. Step 2: Convert to fraction form
    900.82/1,243.15 = 528.02/x
  3. Step 3: Cross multiply
    900.82x = 1,243.15 × 528.02
  4. Step 4: Simplify right side
    900.82x = 656,405.42
  5. Step 5: Solve for x
    x = 656,405.42/900.82
  6. Step 6: Final answer
    x = 728.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.