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Finding the Fourth Proportional to 3,100.79, 4,277.50 and 1,980.55

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Solution

The fourth proportional to 3,100.79, 4,277.50 and 1,980.55 is: 2,732.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,100.79 : 4,277.50 = 1,980.55 : x
  2. Step 2: Convert to fraction form
    3,100.79/4,277.50 = 1,980.55/x
  3. Step 3: Cross multiply
    3,100.79x = 4,277.50 × 1,980.55
  4. Step 4: Simplify right side
    3,100.79x = 8,471,803.02
  5. Step 5: Solve for x
    x = 8,471,803.02/3,100.79
  6. Step 6: Final answer
    x = 2,732.14

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1.5x scale

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.