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Finding the Fourth Proportional to 54,479.34, 81,712.80 and 18,933.84

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Solution

The fourth proportional to 54,479.34, 81,712.80 and 18,933.84 is: 28,398.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,479.34 : 81,712.80 = 18,933.84 : x
  2. Step 2: Convert to fraction form
    54,479.34/81,712.80 = 18,933.84/x
  3. Step 3: Cross multiply
    54,479.34x = 81,712.80 × 18,933.84
  4. Step 4: Simplify right side
    54,479.34x = 1,547,137,081.15
  5. Step 5: Solve for x
    x = 1,547,137,081.15/54,479.34
  6. Step 6: Final answer
    x = 28,398.60

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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.