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Finding the Fourth Proportional to 959.13, 1,320.93 and 891.09

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Solution

The fourth proportional to 959.13, 1,320.93 and 891.09 is: 1,227.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.13 : 1,320.93 = 891.09 : x
  2. Step 2: Convert to fraction form
    959.13/1,320.93 = 891.09/x
  3. Step 3: Cross multiply
    959.13x = 1,320.93 × 891.09
  4. Step 4: Simplify right side
    959.13x = 1,177,067.51
  5. Step 5: Solve for x
    x = 1,177,067.51/959.13
  6. Step 6: Final answer
    x = 1,227.22

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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.