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Finding the Fourth Proportional to 914.99, 1,371.33 and 394.40

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Solution

The fourth proportional to 914.99, 1,371.33 and 394.40 is: 591.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.99 : 1,371.33 = 394.40 : x
  2. Step 2: Convert to fraction form
    914.99/1,371.33 = 394.40/x
  3. Step 3: Cross multiply
    914.99x = 1,371.33 × 394.40
  4. Step 4: Simplify right side
    914.99x = 540,855.98
  5. Step 5: Solve for x
    x = 540,855.98/914.99
  6. Step 6: Final answer
    x = 591.11

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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.