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Finding the Fourth Proportional to 57,956.48, 86,912.39 and 20,509.57

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Solution

The fourth proportional to 57,956.48, 86,912.39 and 20,509.57 is: 30,756.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,956.48 : 86,912.39 = 20,509.57 : x
  2. Step 2: Convert to fraction form
    57,956.48/86,912.39 = 20,509.57/x
  3. Step 3: Cross multiply
    57,956.48x = 86,912.39 × 20,509.57
  4. Step 4: Simplify right side
    57,956.48x = 1,782,535,426.74
  5. Step 5: Solve for x
    x = 1,782,535,426.74/57,956.48
  6. Step 6: Final answer
    x = 30,756.45

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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.