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Finding the Fourth Proportional to 1,193.36, 1,647.60 and 862.88

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Solution

The fourth proportional to 1,193.36, 1,647.60 and 862.88 is: 1,191.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,193.36 : 1,647.60 = 862.88 : x
  2. Step 2: Convert to fraction form
    1,193.36/1,647.60 = 862.88/x
  3. Step 3: Cross multiply
    1,193.36x = 1,647.60 × 862.88
  4. Step 4: Simplify right side
    1,193.36x = 1,421,681.09
  5. Step 5: Solve for x
    x = 1,421,681.09/1,193.36
  6. Step 6: Final answer
    x = 1,191.33

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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.