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Finding the Fourth Proportional to 66,619.78, 100,000.77 and 28,687.81

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Solution

The fourth proportional to 66,619.78, 100,000.77 and 28,687.81 is: 43,062.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,619.78 : 100,000.77 = 28,687.81 : x
  2. Step 2: Convert to fraction form
    66,619.78/100,000.77 = 28,687.81/x
  3. Step 3: Cross multiply
    66,619.78x = 100,000.77 × 28,687.81
  4. Step 4: Simplify right side
    66,619.78x = 2,868,803,089.61
  5. Step 5: Solve for x
    x = 2,868,803,089.61/66,619.78
  6. Step 6: Final answer
    x = 43,062.33

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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.