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Finding the Fourth Proportional to 990.29, 1,483.38 and 716.91

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Solution

The fourth proportional to 990.29, 1,483.38 and 716.91 is: 1,073.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.29 : 1,483.38 = 716.91 : x
  2. Step 2: Convert to fraction form
    990.29/1,483.38 = 716.91/x
  3. Step 3: Cross multiply
    990.29x = 1,483.38 × 716.91
  4. Step 4: Simplify right side
    990.29x = 1,063,449.96
  5. Step 5: Solve for x
    x = 1,063,449.96/990.29
  6. Step 6: Final answer
    x = 1,073.88

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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.