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Finding the Fourth Proportional to 1,091.22, 1,505.89 and 643.19

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Solution

The fourth proportional to 1,091.22, 1,505.89 and 643.19 is: 887.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.22 : 1,505.89 = 643.19 : x
  2. Step 2: Convert to fraction form
    1,091.22/1,505.89 = 643.19/x
  3. Step 3: Cross multiply
    1,091.22x = 1,505.89 × 643.19
  4. Step 4: Simplify right side
    1,091.22x = 968,566.66
  5. Step 5: Solve for x
    x = 968,566.66/1,091.22
  6. Step 6: Final answer
    x = 887.60

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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.