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Finding the Fourth Proportional to 1,189.86, 1,783.80 and 825.36

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Solution

The fourth proportional to 1,189.86, 1,783.80 and 825.36 is: 1,237.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.86 : 1,783.80 = 825.36 : x
  2. Step 2: Convert to fraction form
    1,189.86/1,783.80 = 825.36/x
  3. Step 3: Cross multiply
    1,189.86x = 1,783.80 × 825.36
  4. Step 4: Simplify right side
    1,189.86x = 1,472,277.17
  5. Step 5: Solve for x
    x = 1,472,277.17/1,189.86
  6. Step 6: Final answer
    x = 1,237.35

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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.