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Finding the Fourth Proportional to 990.79, 1,367.34 and 542.69

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Solution

The fourth proportional to 990.79, 1,367.34 and 542.69 is: 748.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.79 : 1,367.34 = 542.69 : x
  2. Step 2: Convert to fraction form
    990.79/1,367.34 = 542.69/x
  3. Step 3: Cross multiply
    990.79x = 1,367.34 × 542.69
  4. Step 4: Simplify right side
    990.79x = 742,043.13
  5. Step 5: Solve for x
    x = 742,043.13/990.79
  6. Step 6: Final answer
    x = 748.94

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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.