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Finding the Fourth Proportional to 914.71, 1,371.65 and 394.47

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Solution

The fourth proportional to 914.71, 1,371.65 and 394.47 is: 591.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.71 : 1,371.65 = 394.47 : x
  2. Step 2: Convert to fraction form
    914.71/1,371.65 = 394.47/x
  3. Step 3: Cross multiply
    914.71x = 1,371.65 × 394.47
  4. Step 4: Simplify right side
    914.71x = 541,067.92
  5. Step 5: Solve for x
    x = 541,067.92/914.71
  6. Step 6: Final answer
    x = 591.52

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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.