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Finding the Fourth Proportional to 1,091.42, 1,505.81 and 619.28

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Solution

The fourth proportional to 1,091.42, 1,505.81 and 619.28 is: 854.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.42 : 1,505.81 = 619.28 : x
  2. Step 2: Convert to fraction form
    1,091.42/1,505.81 = 619.28/x
  3. Step 3: Cross multiply
    1,091.42x = 1,505.81 × 619.28
  4. Step 4: Simplify right side
    1,091.42x = 932,510.49
  5. Step 5: Solve for x
    x = 932,510.49/1,091.42
  6. Step 6: Final answer
    x = 854.41

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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.