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Finding the Fourth Proportional to 2,614.10, 3,921.63 and 859.20

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Solution

The fourth proportional to 2,614.10, 3,921.63 and 859.20 is: 1,288.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,614.10 : 3,921.63 = 859.20 : x
  2. Step 2: Convert to fraction form
    2,614.10/3,921.63 = 859.20/x
  3. Step 3: Cross multiply
    2,614.10x = 3,921.63 × 859.20
  4. Step 4: Simplify right side
    2,614.10x = 3,369,458.81
  5. Step 5: Solve for x
    x = 3,369,458.81/2,614.10
  6. Step 6: Final answer
    x = 1,288.96

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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.