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Finding the Fourth Proportional to 1,007.43, 1,511.22 and 390.87

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Solution

The fourth proportional to 1,007.43, 1,511.22 and 390.87 is: 586.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.43 : 1,511.22 = 390.87 : x
  2. Step 2: Convert to fraction form
    1,007.43/1,511.22 = 390.87/x
  3. Step 3: Cross multiply
    1,007.43x = 1,511.22 × 390.87
  4. Step 4: Simplify right side
    1,007.43x = 590,690.56
  5. Step 5: Solve for x
    x = 590,690.56/1,007.43
  6. Step 6: Final answer
    x = 586.33

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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.