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Finding the Fourth Proportional to 1,089.72, 1,504.31 and 716.90

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Solution

The fourth proportional to 1,089.72, 1,504.31 and 716.90 is: 989.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.72 : 1,504.31 = 716.90 : x
  2. Step 2: Convert to fraction form
    1,089.72/1,504.31 = 716.90/x
  3. Step 3: Cross multiply
    1,089.72x = 1,504.31 × 716.90
  4. Step 4: Simplify right side
    1,089.72x = 1,078,428.73
  5. Step 5: Solve for x
    x = 1,078,428.73/1,089.72
  6. Step 6: Final answer
    x = 989.64

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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.