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Finding the Fourth Proportional to 914.94, 1,372.38 and 394.50

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Solution

The fourth proportional to 914.94, 1,372.38 and 394.50 is: 591.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.94 : 1,372.38 = 394.50 : x
  2. Step 2: Convert to fraction form
    914.94/1,372.38 = 394.50/x
  3. Step 3: Cross multiply
    914.94x = 1,372.38 × 394.50
  4. Step 4: Simplify right side
    914.94x = 541,403.91
  5. Step 5: Solve for x
    x = 541,403.91/914.94
  6. Step 6: Final answer
    x = 591.74

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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.