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Finding the Fourth Proportional to 2,115.61, 3,173.75 and 654.42

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Solution

The fourth proportional to 2,115.61, 3,173.75 and 654.42 is: 981.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.61 : 3,173.75 = 654.42 : x
  2. Step 2: Convert to fraction form
    2,115.61/3,173.75 = 654.42/x
  3. Step 3: Cross multiply
    2,115.61x = 3,173.75 × 654.42
  4. Step 4: Simplify right side
    2,115.61x = 2,076,965.48
  5. Step 5: Solve for x
    x = 2,076,965.48/2,115.61
  6. Step 6: Final answer
    x = 981.73

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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.