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Finding the Fourth Proportional to 57,867.91, 86,808.81 and 20,420.25

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Solution

The fourth proportional to 57,867.91, 86,808.81 and 20,420.25 is: 30,632.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,867.91 : 86,808.81 = 20,420.25 : x
  2. Step 2: Convert to fraction form
    57,867.91/86,808.81 = 20,420.25/x
  3. Step 3: Cross multiply
    57,867.91x = 86,808.81 × 20,420.25
  4. Step 4: Simplify right side
    57,867.91x = 1,772,657,602.40
  5. Step 5: Solve for x
    x = 1,772,657,602.40/57,867.91
  6. Step 6: Final answer
    x = 30,632.83

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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.