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Finding the Fourth Proportional to 991.29, 1,368.65 and 886.04

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Solution

The fourth proportional to 991.29, 1,368.65 and 886.04 is: 1,223.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.29 : 1,368.65 = 886.04 : x
  2. Step 2: Convert to fraction form
    991.29/1,368.65 = 886.04/x
  3. Step 3: Cross multiply
    991.29x = 1,368.65 × 886.04
  4. Step 4: Simplify right side
    991.29x = 1,212,674.22
  5. Step 5: Solve for x
    x = 1,212,674.22/991.29
  6. Step 6: Final answer
    x = 1,223.33

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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.