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Finding the Fourth Proportional to 72,228.56, 99,680.63 and 40,407.71

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Solution

The fourth proportional to 72,228.56, 99,680.63 and 40,407.71 is: 55,765.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,228.56 : 99,680.63 = 40,407.71 : x
  2. Step 2: Convert to fraction form
    72,228.56/99,680.63 = 40,407.71/x
  3. Step 3: Cross multiply
    72,228.56x = 99,680.63 × 40,407.71
  4. Step 4: Simplify right side
    72,228.56x = 4,027,865,289.22
  5. Step 5: Solve for x
    x = 4,027,865,289.22/72,228.56
  6. Step 6: Final answer
    x = 55,765.55

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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.