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Finding the Fourth Proportional to 57,430.80, 86,145.66 and 19,990.80

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Solution

The fourth proportional to 57,430.80, 86,145.66 and 19,990.80 is: 29,986.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,430.80 : 86,145.66 = 19,990.80 : x
  2. Step 2: Convert to fraction form
    57,430.80/86,145.66 = 19,990.80/x
  3. Step 3: Cross multiply
    57,430.80x = 86,145.66 × 19,990.80
  4. Step 4: Simplify right side
    57,430.80x = 1,722,120,659.93
  5. Step 5: Solve for x
    x = 1,722,120,659.93/57,430.80
  6. Step 6: Final answer
    x = 29,986.01

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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.