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Finding the Fourth Proportional to 79,686.70, 119,530.13 and 20,522.50

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Solution

The fourth proportional to 79,686.70, 119,530.13 and 20,522.50 is: 30,783.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,686.70 : 119,530.13 = 20,522.50 : x
  2. Step 2: Convert to fraction form
    79,686.70/119,530.13 = 20,522.50/x
  3. Step 3: Cross multiply
    79,686.70x = 119,530.13 × 20,522.50
  4. Step 4: Simplify right side
    79,686.70x = 2,453,057,092.93
  5. Step 5: Solve for x
    x = 2,453,057,092.93/79,686.70
  6. Step 6: Final answer
    x = 30,783.77

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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.