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Finding the Fourth Proportional to 900.25, 1,350.78 and 515.50

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Solution

The fourth proportional to 900.25, 1,350.78 and 515.50 is: 773.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.25 : 1,350.78 = 515.50 : x
  2. Step 2: Convert to fraction form
    900.25/1,350.78 = 515.50/x
  3. Step 3: Cross multiply
    900.25x = 1,350.78 × 515.50
  4. Step 4: Simplify right side
    900.25x = 696,327.09
  5. Step 5: Solve for x
    x = 696,327.09/900.25
  6. Step 6: Final answer
    x = 773.48

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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.