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Finding the Fourth Proportional to 1,392.66, 2,087.46 and 661.23

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Solution

The fourth proportional to 1,392.66, 2,087.46 and 661.23 is: 991.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.66 : 2,087.46 = 661.23 : x
  2. Step 2: Convert to fraction form
    1,392.66/2,087.46 = 661.23/x
  3. Step 3: Cross multiply
    1,392.66x = 2,087.46 × 661.23
  4. Step 4: Simplify right side
    1,392.66x = 1,380,291.18
  5. Step 5: Solve for x
    x = 1,380,291.18/1,392.66
  6. Step 6: Final answer
    x = 991.12

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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.