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Finding the Fourth Proportional to 81,354.99, 122,118.75 and 72,055.38

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Solution

The fourth proportional to 81,354.99, 122,118.75 and 72,055.38 is: 108,159.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,354.99 : 122,118.75 = 72,055.38 : x
  2. Step 2: Convert to fraction form
    81,354.99/122,118.75 = 72,055.38/x
  3. Step 3: Cross multiply
    81,354.99x = 122,118.75 × 72,055.38
  4. Step 4: Simplify right side
    81,354.99x = 8,799,312,936.38
  5. Step 5: Solve for x
    x = 8,799,312,936.38/81,354.99
  6. Step 6: Final answer
    x = 108,159.47

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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.