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Finding the Fourth Proportional to 1,240.66, 1,861.77 and 720.34

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Solution

The fourth proportional to 1,240.66, 1,861.77 and 720.34 is: 1,080.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.66 : 1,861.77 = 720.34 : x
  2. Step 2: Convert to fraction form
    1,240.66/1,861.77 = 720.34/x
  3. Step 3: Cross multiply
    1,240.66x = 1,861.77 × 720.34
  4. Step 4: Simplify right side
    1,240.66x = 1,341,107.40
  5. Step 5: Solve for x
    x = 1,341,107.40/1,240.66
  6. Step 6: Final answer
    x = 1,080.96

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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.