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Finding the Fourth Proportional to 73,721.40, 110,571.30 and 21,125.40

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Solution

The fourth proportional to 73,721.40, 110,571.30 and 21,125.40 is: 31,685.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,721.40 : 110,571.30 = 21,125.40 : x
  2. Step 2: Convert to fraction form
    73,721.40/110,571.30 = 21,125.40/x
  3. Step 3: Cross multiply
    73,721.40x = 110,571.30 × 21,125.40
  4. Step 4: Simplify right side
    73,721.40x = 2,335,862,941.02
  5. Step 5: Solve for x
    x = 2,335,862,941.02/73,721.40
  6. Step 6: Final answer
    x = 31,685.01

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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.