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Finding the Fourth Proportional to 2,871.61, 4,307.20 and 791.55

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Solution

The fourth proportional to 2,871.61, 4,307.20 and 791.55 is: 1,187.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,871.61 : 4,307.20 = 791.55 : x
  2. Step 2: Convert to fraction form
    2,871.61/4,307.20 = 791.55/x
  3. Step 3: Cross multiply
    2,871.61x = 4,307.20 × 791.55
  4. Step 4: Simplify right side
    2,871.61x = 3,409,362.18
  5. Step 5: Solve for x
    x = 3,409,362.18/2,871.61
  6. Step 6: Final answer
    x = 1,187.27

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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.