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Finding the Fourth Proportional to 990.32, 1,487.84 and 937.92

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Solution

The fourth proportional to 990.32, 1,487.84 and 937.92 is: 1,409.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.32 : 1,487.84 = 937.92 : x
  2. Step 2: Convert to fraction form
    990.32/1,487.84 = 937.92/x
  3. Step 3: Cross multiply
    990.32x = 1,487.84 × 937.92
  4. Step 4: Simplify right side
    990.32x = 1,395,474.89
  5. Step 5: Solve for x
    x = 1,395,474.89/990.32
  6. Step 6: Final answer
    x = 1,409.12

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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.