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Finding the Fourth Proportional to 1,116.43, 1,540.75 and 619.09

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Solution

The fourth proportional to 1,116.43, 1,540.75 and 619.09 is: 854.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.43 : 1,540.75 = 619.09 : x
  2. Step 2: Convert to fraction form
    1,116.43/1,540.75 = 619.09/x
  3. Step 3: Cross multiply
    1,116.43x = 1,540.75 × 619.09
  4. Step 4: Simplify right side
    1,116.43x = 953,862.92
  5. Step 5: Solve for x
    x = 953,862.92/1,116.43
  6. Step 6: Final answer
    x = 854.39

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1.5x scale

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.