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Finding the Fourth Proportional to 61,089.90, 91,649.19 and 18,967.80

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Solution

The fourth proportional to 61,089.90, 91,649.19 and 18,967.80 is: 28,456.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,089.90 : 91,649.19 = 18,967.80 : x
  2. Step 2: Convert to fraction form
    61,089.90/91,649.19 = 18,967.80/x
  3. Step 3: Cross multiply
    61,089.90x = 91,649.19 × 18,967.80
  4. Step 4: Simplify right side
    61,089.90x = 1,738,383,814.20
  5. Step 5: Solve for x
    x = 1,738,383,814.20/61,089.90
  6. Step 6: Final answer
    x = 28,456.16

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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.