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Finding the Fourth Proportional to 1,392.87, 2,079.76 and 1,342.47

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Solution

The fourth proportional to 1,392.87, 2,079.76 and 1,342.47 is: 2,004.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.87 : 2,079.76 = 1,342.47 : x
  2. Step 2: Convert to fraction form
    1,392.87/2,079.76 = 1,342.47/x
  3. Step 3: Cross multiply
    1,392.87x = 2,079.76 × 1,342.47
  4. Step 4: Simplify right side
    1,392.87x = 2,792,012.05
  5. Step 5: Solve for x
    x = 2,792,012.05/1,392.87
  6. Step 6: Final answer
    x = 2,004.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.