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Finding the Fourth Proportional to 1,107.12, 1,659.76 and 521.83

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Solution

The fourth proportional to 1,107.12, 1,659.76 and 521.83 is: 782.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.12 : 1,659.76 = 521.83 : x
  2. Step 2: Convert to fraction form
    1,107.12/1,659.76 = 521.83/x
  3. Step 3: Cross multiply
    1,107.12x = 1,659.76 × 521.83
  4. Step 4: Simplify right side
    1,107.12x = 866,112.56
  5. Step 5: Solve for x
    x = 866,112.56/1,107.12
  6. Step 6: Final answer
    x = 782.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.