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Finding the Fourth Proportional to 914.78, 1,251.20 and 900.42

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Solution

The fourth proportional to 914.78, 1,251.20 and 900.42 is: 1,231.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.78 : 1,251.20 = 900.42 : x
  2. Step 2: Convert to fraction form
    914.78/1,251.20 = 900.42/x
  3. Step 3: Cross multiply
    914.78x = 1,251.20 × 900.42
  4. Step 4: Simplify right side
    914.78x = 1,126,601.00
  5. Step 5: Solve for x
    x = 1,126,601.00/914.78
  6. Step 6: Final answer
    x = 1,231.56

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.