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Finding the Fourth Proportional to 1,005.67, 1,508.90 and 312.39

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Solution

The fourth proportional to 1,005.67, 1,508.90 and 312.39 is: 468.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.67 : 1,508.90 = 312.39 : x
  2. Step 2: Convert to fraction form
    1,005.67/1,508.90 = 312.39/x
  3. Step 3: Cross multiply
    1,005.67x = 1,508.90 × 312.39
  4. Step 4: Simplify right side
    1,005.67x = 471,369.04
  5. Step 5: Solve for x
    x = 471,369.04/1,005.67
  6. Step 6: Final answer
    x = 468.71

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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.