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Finding the Fourth Proportional to 1,392.98, 1,922.73 and 862.02

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Solution

The fourth proportional to 1,392.98, 1,922.73 and 862.02 is: 1,189.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.98 : 1,922.73 = 862.02 : x
  2. Step 2: Convert to fraction form
    1,392.98/1,922.73 = 862.02/x
  3. Step 3: Cross multiply
    1,392.98x = 1,922.73 × 862.02
  4. Step 4: Simplify right side
    1,392.98x = 1,657,431.71
  5. Step 5: Solve for x
    x = 1,657,431.71/1,392.98
  6. Step 6: Final answer
    x = 1,189.85

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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.