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Finding the Fourth Proportional to 1,392.87, 1,922.26 and 803.45

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Solution

The fourth proportional to 1,392.87, 1,922.26 and 803.45 is: 1,108.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.87 : 1,922.26 = 803.45 : x
  2. Step 2: Convert to fraction form
    1,392.87/1,922.26 = 803.45/x
  3. Step 3: Cross multiply
    1,392.87x = 1,922.26 × 803.45
  4. Step 4: Simplify right side
    1,392.87x = 1,544,439.80
  5. Step 5: Solve for x
    x = 1,544,439.80/1,392.87
  6. Step 6: Final answer
    x = 1,108.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.