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Finding the Fourth Proportional to 999.63, 1,500.05 and 938.88

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Solution

The fourth proportional to 999.63, 1,500.05 and 938.88 is: 1,408.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.63 : 1,500.05 = 938.88 : x
  2. Step 2: Convert to fraction form
    999.63/1,500.05 = 938.88/x
  3. Step 3: Cross multiply
    999.63x = 1,500.05 × 938.88
  4. Step 4: Simplify right side
    999.63x = 1,408,366.94
  5. Step 5: Solve for x
    x = 1,408,366.94/999.63
  6. Step 6: Final answer
    x = 1,408.89

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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.