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Finding the Fourth Proportional to 57,901.80, 86,859.70 and 20,454.21

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Solution

The fourth proportional to 57,901.80, 86,859.70 and 20,454.21 is: 30,683.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,901.80 : 86,859.70 = 20,454.21 : x
  2. Step 2: Convert to fraction form
    57,901.80/86,859.70 = 20,454.21/x
  3. Step 3: Cross multiply
    57,901.80x = 86,859.70 × 20,454.21
  4. Step 4: Simplify right side
    57,901.80x = 1,776,646,544.34
  5. Step 5: Solve for x
    x = 1,776,646,544.34/57,901.80
  6. Step 6: Final answer
    x = 30,683.79

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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.