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Finding the Fourth Proportional to 1,759.61, 2,638.44 and 720.34

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Solution

The fourth proportional to 1,759.61, 2,638.44 and 720.34 is: 1,080.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,759.61 : 2,638.44 = 720.34 : x
  2. Step 2: Convert to fraction form
    1,759.61/2,638.44 = 720.34/x
  3. Step 3: Cross multiply
    1,759.61x = 2,638.44 × 720.34
  4. Step 4: Simplify right side
    1,759.61x = 1,900,570.27
  5. Step 5: Solve for x
    x = 1,900,570.27/1,759.61
  6. Step 6: Final answer
    x = 1,080.11

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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.