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Finding the Fourth Proportional to 1,393.47, 2,087.37 and 660.83

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Solution

The fourth proportional to 1,393.47, 2,087.37 and 660.83 is: 989.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.47 : 2,087.37 = 660.83 : x
  2. Step 2: Convert to fraction form
    1,393.47/2,087.37 = 660.83/x
  3. Step 3: Cross multiply
    1,393.47x = 2,087.37 × 660.83
  4. Step 4: Simplify right side
    1,393.47x = 1,379,386.28
  5. Step 5: Solve for x
    x = 1,379,386.28/1,393.47
  6. Step 6: Final answer
    x = 989.89

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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.