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Finding the Fourth Proportional to 1,106.80, 1,660.20 and 761.20

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Solution

The fourth proportional to 1,106.80, 1,660.20 and 761.20 is: 1,141.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.80 : 1,660.20 = 761.20 : x
  2. Step 2: Convert to fraction form
    1,106.80/1,660.20 = 761.20/x
  3. Step 3: Cross multiply
    1,106.80x = 1,660.20 × 761.20
  4. Step 4: Simplify right side
    1,106.80x = 1,263,744.24
  5. Step 5: Solve for x
    x = 1,263,744.24/1,106.80
  6. Step 6: Final answer
    x = 1,141.80

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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.