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Finding the Fourth Proportional to 1,657.46, 2,485.92 and 561.80

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Solution

The fourth proportional to 1,657.46, 2,485.92 and 561.80 is: 842.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,657.46 : 2,485.92 = 561.80 : x
  2. Step 2: Convert to fraction form
    1,657.46/2,485.92 = 561.80/x
  3. Step 3: Cross multiply
    1,657.46x = 2,485.92 × 561.80
  4. Step 4: Simplify right side
    1,657.46x = 1,396,589.86
  5. Step 5: Solve for x
    x = 1,396,589.86/1,657.46
  6. Step 6: Final answer
    x = 842.61

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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.