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Finding the Fourth Proportional to 1,007.42, 1,511.31 and 382.90

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Solution

The fourth proportional to 1,007.42, 1,511.31 and 382.90 is: 574.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.42 : 1,511.31 = 382.90 : x
  2. Step 2: Convert to fraction form
    1,007.42/1,511.31 = 382.90/x
  3. Step 3: Cross multiply
    1,007.42x = 1,511.31 × 382.90
  4. Step 4: Simplify right side
    1,007.42x = 578,680.60
  5. Step 5: Solve for x
    x = 578,680.60/1,007.42
  6. Step 6: Final answer
    x = 574.42

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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.