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Finding the Fourth Proportional to 990.91, 1,367.39 and 581.75

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Solution

The fourth proportional to 990.91, 1,367.39 and 581.75 is: 802.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.91 : 1,367.39 = 581.75 : x
  2. Step 2: Convert to fraction form
    990.91/1,367.39 = 581.75/x
  3. Step 3: Cross multiply
    990.91x = 1,367.39 × 581.75
  4. Step 4: Simplify right side
    990.91x = 795,472.30
  5. Step 5: Solve for x
    x = 795,472.30/990.91
  6. Step 6: Final answer
    x = 802.77

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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.