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Finding the Fourth Proportional to 2,660.81, 3,985.08 and 1,275.12

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Solution

The fourth proportional to 2,660.81, 3,985.08 and 1,275.12 is: 1,909.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.81 : 3,985.08 = 1,275.12 : x
  2. Step 2: Convert to fraction form
    2,660.81/3,985.08 = 1,275.12/x
  3. Step 3: Cross multiply
    2,660.81x = 3,985.08 × 1,275.12
  4. Step 4: Simplify right side
    2,660.81x = 5,081,455.21
  5. Step 5: Solve for x
    x = 5,081,455.21/2,660.81
  6. Step 6: Final answer
    x = 1,909.74

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1.5x scale

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.