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Finding the Fourth Proportional to 990.35, 1,487.95 and 746.13

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Solution

The fourth proportional to 990.35, 1,487.95 and 746.13 is: 1,121.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.35 : 1,487.95 = 746.13 : x
  2. Step 2: Convert to fraction form
    990.35/1,487.95 = 746.13/x
  3. Step 3: Cross multiply
    990.35x = 1,487.95 × 746.13
  4. Step 4: Simplify right side
    990.35x = 1,110,204.13
  5. Step 5: Solve for x
    x = 1,110,204.13/990.35
  6. Step 6: Final answer
    x = 1,121.02

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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.