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Finding the Fourth Proportional to 57,891.60, 86,837.40 and 20,493.90

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Solution

The fourth proportional to 57,891.60, 86,837.40 and 20,493.90 is: 30,740.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,891.60 : 86,837.40 = 20,493.90 : x
  2. Step 2: Convert to fraction form
    57,891.60/86,837.40 = 20,493.90/x
  3. Step 3: Cross multiply
    57,891.60x = 86,837.40 × 20,493.90
  4. Step 4: Simplify right side
    57,891.60x = 1,779,636,991.86
  5. Step 5: Solve for x
    x = 1,779,636,991.86/57,891.60
  6. Step 6: Final answer
    x = 30,740.85

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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.