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Finding the Fourth Proportional to 900.74, 1,351.20 and 284.48

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Solution

The fourth proportional to 900.74, 1,351.20 and 284.48 is: 426.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.74 : 1,351.20 = 284.48 : x
  2. Step 2: Convert to fraction form
    900.74/1,351.20 = 284.48/x
  3. Step 3: Cross multiply
    900.74x = 1,351.20 × 284.48
  4. Step 4: Simplify right side
    900.74x = 384,389.38
  5. Step 5: Solve for x
    x = 384,389.38/900.74
  6. Step 6: Final answer
    x = 426.75

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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.