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Finding the Fourth Proportional to 53,155.68, 79,730.28 and 21,990.12

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Solution

The fourth proportional to 53,155.68, 79,730.28 and 21,990.12 is: 32,983.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,155.68 : 79,730.28 = 21,990.12 : x
  2. Step 2: Convert to fraction form
    53,155.68/79,730.28 = 21,990.12/x
  3. Step 3: Cross multiply
    53,155.68x = 79,730.28 × 21,990.12
  4. Step 4: Simplify right side
    53,155.68x = 1,753,278,424.83
  5. Step 5: Solve for x
    x = 1,753,278,424.83/53,155.68
  6. Step 6: Final answer
    x = 32,983.84

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.