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Finding the Fourth Proportional to 57,987.55, 86,990.79 and 20,539.51

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Solution

The fourth proportional to 57,987.55, 86,990.79 and 20,539.51 is: 30,812.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,987.55 : 86,990.79 = 20,539.51 : x
  2. Step 2: Convert to fraction form
    57,987.55/86,990.79 = 20,539.51/x
  3. Step 3: Cross multiply
    57,987.55x = 86,990.79 × 20,539.51
  4. Step 4: Simplify right side
    57,987.55x = 1,786,748,201.11
  5. Step 5: Solve for x
    x = 1,786,748,201.11/57,987.55
  6. Step 6: Final answer
    x = 30,812.62

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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.