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Finding the Fourth Proportional to 1,091.40, 1,506.04 and 619.20

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Solution

The fourth proportional to 1,091.40, 1,506.04 and 619.20 is: 854.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.40 : 1,506.04 = 619.20 : x
  2. Step 2: Convert to fraction form
    1,091.40/1,506.04 = 619.20/x
  3. Step 3: Cross multiply
    1,091.40x = 1,506.04 × 619.20
  4. Step 4: Simplify right side
    1,091.40x = 932,539.97
  5. Step 5: Solve for x
    x = 932,539.97/1,091.40
  6. Step 6: Final answer
    x = 854.44

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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.