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Finding the Fourth Proportional to 67,812.40, 101,720.40 and 21,066.40

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Solution

The fourth proportional to 67,812.40, 101,720.40 and 21,066.40 is: 31,600.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,812.40 : 101,720.40 = 21,066.40 : x
  2. Step 2: Convert to fraction form
    67,812.40/101,720.40 = 21,066.40/x
  3. Step 3: Cross multiply
    67,812.40x = 101,720.40 × 21,066.40
  4. Step 4: Simplify right side
    67,812.40x = 2,142,882,634.56
  5. Step 5: Solve for x
    x = 2,142,882,634.56/67,812.40
  6. Step 6: Final answer
    x = 31,600.16

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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.