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Finding the Fourth Proportional to 991.01, 1,368.13 and 676.74

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Solution

The fourth proportional to 991.01, 1,368.13 and 676.74 is: 934.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.01 : 1,368.13 = 676.74 : x
  2. Step 2: Convert to fraction form
    991.01/1,368.13 = 676.74/x
  3. Step 3: Cross multiply
    991.01x = 1,368.13 × 676.74
  4. Step 4: Simplify right side
    991.01x = 925,861.47
  5. Step 5: Solve for x
    x = 925,861.47/991.01
  6. Step 6: Final answer
    x = 934.27

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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.