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Finding the Fourth Proportional to 990.83, 1,367.46 and 632.18

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Solution

The fourth proportional to 990.83, 1,367.46 and 632.18 is: 872.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.83 : 1,367.46 = 632.18 : x
  2. Step 2: Convert to fraction form
    990.83/1,367.46 = 632.18/x
  3. Step 3: Cross multiply
    990.83x = 1,367.46 × 632.18
  4. Step 4: Simplify right side
    990.83x = 864,484.28
  5. Step 5: Solve for x
    x = 864,484.28/990.83
  6. Step 6: Final answer
    x = 872.48

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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.