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Finding the Fourth Proportional to 1,707.57, 2,561.39 and 611.91

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Solution

The fourth proportional to 1,707.57, 2,561.39 and 611.91 is: 917.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,707.57 : 2,561.39 = 611.91 : x
  2. Step 2: Convert to fraction form
    1,707.57/2,561.39 = 611.91/x
  3. Step 3: Cross multiply
    1,707.57x = 2,561.39 × 611.91
  4. Step 4: Simplify right side
    1,707.57x = 1,567,337.10
  5. Step 5: Solve for x
    x = 1,567,337.10/1,707.57
  6. Step 6: Final answer
    x = 917.88

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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.