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Finding the Fourth Proportional to 1,108.54, 1,660.92 and 783.28

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Solution

The fourth proportional to 1,108.54, 1,660.92 and 783.28 is: 1,173.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.54 : 1,660.92 = 783.28 : x
  2. Step 2: Convert to fraction form
    1,108.54/1,660.92 = 783.28/x
  3. Step 3: Cross multiply
    1,108.54x = 1,660.92 × 783.28
  4. Step 4: Simplify right side
    1,108.54x = 1,300,965.42
  5. Step 5: Solve for x
    x = 1,300,965.42/1,108.54
  6. Step 6: Final answer
    x = 1,173.58

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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.