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Finding the Fourth Proportional to 87,980.61, 131,969.79 and 21,420.81

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Solution

The fourth proportional to 87,980.61, 131,969.79 and 21,420.81 is: 32,130.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,980.61 : 131,969.79 = 21,420.81 : x
  2. Step 2: Convert to fraction form
    87,980.61/131,969.79 = 21,420.81/x
  3. Step 3: Cross multiply
    87,980.61x = 131,969.79 × 21,420.81
  4. Step 4: Simplify right side
    87,980.61x = 2,826,899,797.33
  5. Step 5: Solve for x
    x = 2,826,899,797.33/87,980.61
  6. Step 6: Final answer
    x = 32,130.94

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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.