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Finding the Fourth Proportional to 72,243.76, 99,701.64 and 40,422.91

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Solution

The fourth proportional to 72,243.76, 99,701.64 and 40,422.91 is: 55,786.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,243.76 : 99,701.64 = 40,422.91 : x
  2. Step 2: Convert to fraction form
    72,243.76/99,701.64 = 40,422.91/x
  3. Step 3: Cross multiply
    72,243.76x = 99,701.64 × 40,422.91
  4. Step 4: Simplify right side
    72,243.76x = 4,030,230,171.32
  5. Step 5: Solve for x
    x = 4,030,230,171.32/72,243.76
  6. Step 6: Final answer
    x = 55,786.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.