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Finding the Fourth Proportional to 1,005.42, 1,508.57 and 518.82

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Solution

The fourth proportional to 1,005.42, 1,508.57 and 518.82 is: 778.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.42 : 1,508.57 = 518.82 : x
  2. Step 2: Convert to fraction form
    1,005.42/1,508.57 = 518.82/x
  3. Step 3: Cross multiply
    1,005.42x = 1,508.57 × 518.82
  4. Step 4: Simplify right side
    1,005.42x = 782,673.69
  5. Step 5: Solve for x
    x = 782,673.69/1,005.42
  6. Step 6: Final answer
    x = 778.45

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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.