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Finding the Fourth Proportional to 71,988.92, 107,985.91 and 19,399.66

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Solution

The fourth proportional to 71,988.92, 107,985.91 and 19,399.66 is: 29,100.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,988.92 : 107,985.91 = 19,399.66 : x
  2. Step 2: Convert to fraction form
    71,988.92/107,985.91 = 19,399.66/x
  3. Step 3: Cross multiply
    71,988.92x = 107,985.91 × 19,399.66
  4. Step 4: Simplify right side
    71,988.92x = 2,094,889,938.79
  5. Step 5: Solve for x
    x = 2,094,889,938.79/71,988.92
  6. Step 6: Final answer
    x = 29,100.17

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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.