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Finding the Fourth Proportional to 1,053.90, 1,453.78 and 611.75

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Solution

The fourth proportional to 1,053.90, 1,453.78 and 611.75 is: 843.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.90 : 1,453.78 = 611.75 : x
  2. Step 2: Convert to fraction form
    1,053.90/1,453.78 = 611.75/x
  3. Step 3: Cross multiply
    1,053.90x = 1,453.78 × 611.75
  4. Step 4: Simplify right side
    1,053.90x = 889,341.12
  5. Step 5: Solve for x
    x = 889,341.12/1,053.90
  6. Step 6: Final answer
    x = 843.86

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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.