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Finding the Fourth Proportional to 1,391.88, 2,088.05 and 661.06

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Solution

The fourth proportional to 1,391.88, 2,088.05 and 661.06 is: 991.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.88 : 2,088.05 = 661.06 : x
  2. Step 2: Convert to fraction form
    1,391.88/2,088.05 = 661.06/x
  3. Step 3: Cross multiply
    1,391.88x = 2,088.05 × 661.06
  4. Step 4: Simplify right side
    1,391.88x = 1,380,326.33
  5. Step 5: Solve for x
    x = 1,380,326.33/1,391.88
  6. Step 6: Final answer
    x = 991.70

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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.