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Finding the Fourth Proportional to 1,392.21, 2,088.87 and 611.81

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Solution

The fourth proportional to 1,392.21, 2,088.87 and 611.81 is: 917.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.21 : 2,088.87 = 611.81 : x
  2. Step 2: Convert to fraction form
    1,392.21/2,088.87 = 611.81/x
  3. Step 3: Cross multiply
    1,392.21x = 2,088.87 × 611.81
  4. Step 4: Simplify right side
    1,392.21x = 1,277,991.55
  5. Step 5: Solve for x
    x = 1,277,991.55/1,392.21
  6. Step 6: Final answer
    x = 917.96

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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.