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Finding the Fourth Proportional to 991.17, 1,367.67 and 592.74

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Solution

The fourth proportional to 991.17, 1,367.67 and 592.74 is: 817.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.17 : 1,367.67 = 592.74 : x
  2. Step 2: Convert to fraction form
    991.17/1,367.67 = 592.74/x
  3. Step 3: Cross multiply
    991.17x = 1,367.67 × 592.74
  4. Step 4: Simplify right side
    991.17x = 810,672.72
  5. Step 5: Solve for x
    x = 810,672.72/991.17
  6. Step 6: Final answer
    x = 817.89

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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.