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Finding the Fourth Proportional to 900.95, 1,243.32 and 528.15

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Solution

The fourth proportional to 900.95, 1,243.32 and 528.15 is: 728.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.95 : 1,243.32 = 528.15 : x
  2. Step 2: Convert to fraction form
    900.95/1,243.32 = 528.15/x
  3. Step 3: Cross multiply
    900.95x = 1,243.32 × 528.15
  4. Step 4: Simplify right side
    900.95x = 656,659.46
  5. Step 5: Solve for x
    x = 656,659.46/900.95
  6. Step 6: Final answer
    x = 728.85

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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.