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Finding the Fourth Proportional to 914.28, 1,370.12 and 393.56

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Solution

The fourth proportional to 914.28, 1,370.12 and 393.56 is: 589.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.28 : 1,370.12 = 393.56 : x
  2. Step 2: Convert to fraction form
    914.28/1,370.12 = 393.56/x
  3. Step 3: Cross multiply
    914.28x = 1,370.12 × 393.56
  4. Step 4: Simplify right side
    914.28x = 539,224.43
  5. Step 5: Solve for x
    x = 539,224.43/914.28
  6. Step 6: Final answer
    x = 589.78

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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.