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Finding the Fourth Proportional to 1,387.81, 2,082.74 and 657.39

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Solution

The fourth proportional to 1,387.81, 2,082.74 and 657.39 is: 986.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.81 : 2,082.74 = 657.39 : x
  2. Step 2: Convert to fraction form
    1,387.81/2,082.74 = 657.39/x
  3. Step 3: Cross multiply
    1,387.81x = 2,082.74 × 657.39
  4. Step 4: Simplify right side
    1,387.81x = 1,369,162.03
  5. Step 5: Solve for x
    x = 1,369,162.03/1,387.81
  6. Step 6: Final answer
    x = 986.56

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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.