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Finding the Fourth Proportional to 54,009.20, 81,013.80 and 47,448.20

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Solution

The fourth proportional to 54,009.20, 81,013.80 and 47,448.20 is: 71,172.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,009.20 : 81,013.80 = 47,448.20 : x
  2. Step 2: Convert to fraction form
    54,009.20/81,013.80 = 47,448.20/x
  3. Step 3: Cross multiply
    54,009.20x = 81,013.80 × 47,448.20
  4. Step 4: Simplify right side
    54,009.20x = 3,843,958,985.16
  5. Step 5: Solve for x
    x = 3,843,958,985.16/54,009.20
  6. Step 6: Final answer
    x = 71,172.30

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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.