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Finding the Fourth Proportional to 991.60, 1,369.56 and 934

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Solution

The fourth proportional to 991.60, 1,369.56 and 934 is: 1,290.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.60 : 1,369.56 = 934 : x
  2. Step 2: Convert to fraction form
    991.60/1,369.56 = 934/x
  3. Step 3: Cross multiply
    991.60x = 1,369.56 × 934
  4. Step 4: Simplify right side
    991.60x = 1,279,169.04
  5. Step 5: Solve for x
    x = 1,279,169.04/991.60
  6. Step 6: Final answer
    x = 1,290.01

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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.