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Finding the Fourth Proportional to 1,011.05, 1,515.35 and 394.44

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Solution

The fourth proportional to 1,011.05, 1,515.35 and 394.44 is: 591.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.05 : 1,515.35 = 394.44 : x
  2. Step 2: Convert to fraction form
    1,011.05/1,515.35 = 394.44/x
  3. Step 3: Cross multiply
    1,011.05x = 1,515.35 × 394.44
  4. Step 4: Simplify right side
    1,011.05x = 597,712.68
  5. Step 5: Solve for x
    x = 597,712.68/1,011.05
  6. Step 6: Final answer
    x = 591.18

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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.