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Finding the Fourth Proportional to 72,989.81, 100,726.01 and 42,769.11

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Solution

The fourth proportional to 72,989.81, 100,726.01 and 42,769.11 is: 59,021.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,989.81 : 100,726.01 = 42,769.11 : x
  2. Step 2: Convert to fraction form
    72,989.81/100,726.01 = 42,769.11/x
  3. Step 3: Cross multiply
    72,989.81x = 100,726.01 × 42,769.11
  4. Step 4: Simplify right side
    72,989.81x = 4,307,961,801.55
  5. Step 5: Solve for x
    x = 4,307,961,801.55/72,989.81
  6. Step 6: Final answer
    x = 59,021.41

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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.