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Finding the Fourth Proportional to 74,129.28, 111,212.16 and 21,539.28

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Solution

The fourth proportional to 74,129.28, 111,212.16 and 21,539.28 is: 32,314.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,129.28 : 111,212.16 = 21,539.28 : x
  2. Step 2: Convert to fraction form
    74,129.28/111,212.16 = 21,539.28/x
  3. Step 3: Cross multiply
    74,129.28x = 111,212.16 × 21,539.28
  4. Step 4: Simplify right side
    74,129.28x = 2,395,429,853.64
  5. Step 5: Solve for x
    x = 2,395,429,853.64/74,129.28
  6. Step 6: Final answer
    x = 32,314.22

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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.