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Finding the Fourth Proportional to 1,391.93, 2,086.53 and 660.66

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Solution

The fourth proportional to 1,391.93, 2,086.53 and 660.66 is: 990.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.93 : 2,086.53 = 660.66 : x
  2. Step 2: Convert to fraction form
    1,391.93/2,086.53 = 660.66/x
  3. Step 3: Cross multiply
    1,391.93x = 2,086.53 × 660.66
  4. Step 4: Simplify right side
    1,391.93x = 1,378,482.18
  5. Step 5: Solve for x
    x = 1,378,482.18/1,391.93
  6. Step 6: Final answer
    x = 990.34

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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.