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Finding the Fourth Proportional to 72,479.09, 100,020.87 and 40,648.11

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Solution

The fourth proportional to 72,479.09, 100,020.87 and 40,648.11 is: 56,094.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,479.09 : 100,020.87 = 40,648.11 : x
  2. Step 2: Convert to fraction form
    72,479.09/100,020.87 = 40,648.11/x
  3. Step 3: Cross multiply
    72,479.09x = 100,020.87 × 40,648.11
  4. Step 4: Simplify right side
    72,479.09x = 4,065,659,326.06
  5. Step 5: Solve for x
    x = 4,065,659,326.06/72,479.09
  6. Step 6: Final answer
    x = 56,094.24

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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.