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Finding the Fourth Proportional to 1,720.56, 2,581.78 and 746.66

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Solution

The fourth proportional to 1,720.56, 2,581.78 and 746.66 is: 1,120.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.56 : 2,581.78 = 746.66 : x
  2. Step 2: Convert to fraction form
    1,720.56/2,581.78 = 746.66/x
  3. Step 3: Cross multiply
    1,720.56x = 2,581.78 × 746.66
  4. Step 4: Simplify right side
    1,720.56x = 1,927,711.85
  5. Step 5: Solve for x
    x = 1,927,711.85/1,720.56
  6. Step 6: Final answer
    x = 1,120.40

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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.