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Finding the Fourth Proportional to 990.69, 1,366.97 and 570.97

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Solution

The fourth proportional to 990.69, 1,366.97 and 570.97 is: 787.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.69 : 1,366.97 = 570.97 : x
  2. Step 2: Convert to fraction form
    990.69/1,366.97 = 570.97/x
  3. Step 3: Cross multiply
    990.69x = 1,366.97 × 570.97
  4. Step 4: Simplify right side
    990.69x = 780,498.86
  5. Step 5: Solve for x
    x = 780,498.86/990.69
  6. Step 6: Final answer
    x = 787.83

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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.