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Finding the Fourth Proportional to 54,643.68, 81,986.18 and 21,387.51

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Solution

The fourth proportional to 54,643.68, 81,986.18 and 21,387.51 is: 32,089.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,643.68 : 81,986.18 = 21,387.51 : x
  2. Step 2: Convert to fraction form
    54,643.68/81,986.18 = 21,387.51/x
  3. Step 3: Cross multiply
    54,643.68x = 81,986.18 × 21,387.51
  4. Step 4: Simplify right side
    54,643.68x = 1,753,480,137.67
  5. Step 5: Solve for x
    x = 1,753,480,137.67/54,643.68
  6. Step 6: Final answer
    x = 32,089.35

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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.