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Finding the Fourth Proportional to 72,644.25, 109,130.40 and 43,081.47

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Solution

The fourth proportional to 72,644.25, 109,130.40 and 43,081.47 is: 64,719.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,644.25 : 109,130.40 = 43,081.47 : x
  2. Step 2: Convert to fraction form
    72,644.25/109,130.40 = 43,081.47/x
  3. Step 3: Cross multiply
    72,644.25x = 109,130.40 × 43,081.47
  4. Step 4: Simplify right side
    72,644.25x = 4,701,498,053.69
  5. Step 5: Solve for x
    x = 4,701,498,053.69/72,644.25
  6. Step 6: Final answer
    x = 64,719.48

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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.