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Finding the Fourth Proportional to 999.58, 1,499.34 and 939.46

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Solution

The fourth proportional to 999.58, 1,499.34 and 939.46 is: 1,409.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.58 : 1,499.34 = 939.46 : x
  2. Step 2: Convert to fraction form
    999.58/1,499.34 = 939.46/x
  3. Step 3: Cross multiply
    999.58x = 1,499.34 × 939.46
  4. Step 4: Simplify right side
    999.58x = 1,408,569.96
  5. Step 5: Solve for x
    x = 1,408,569.96/999.58
  6. Step 6: Final answer
    x = 1,409.16

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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.