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Finding the Fourth Proportional to 990.67, 1,366.30 and 742.58

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Solution

The fourth proportional to 990.67, 1,366.30 and 742.58 is: 1,024.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.67 : 1,366.30 = 742.58 : x
  2. Step 2: Convert to fraction form
    990.67/1,366.30 = 742.58/x
  3. Step 3: Cross multiply
    990.67x = 1,366.30 × 742.58
  4. Step 4: Simplify right side
    990.67x = 1,014,587.05
  5. Step 5: Solve for x
    x = 1,014,587.05/990.67
  6. Step 6: Final answer
    x = 1,024.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.