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Finding the Fourth Proportional to 72,990.30, 100,726.70 and 42,769.61

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Solution

The fourth proportional to 72,990.30, 100,726.70 and 42,769.61 is: 59,022.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,990.30 : 100,726.70 = 42,769.61 : x
  2. Step 2: Convert to fraction form
    72,990.30/100,726.70 = 42,769.61/x
  3. Step 3: Cross multiply
    72,990.30x = 100,726.70 × 42,769.61
  4. Step 4: Simplify right side
    72,990.30x = 4,308,041,209.92
  5. Step 5: Solve for x
    x = 4,308,041,209.92/72,990.30
  6. Step 6: Final answer
    x = 59,022.10

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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.