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Finding the Fourth Proportional to 72,476.68, 100,018.65 and 40,211.90

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Solution

The fourth proportional to 72,476.68, 100,018.65 and 40,211.90 is: 55,492.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,476.68 : 100,018.65 = 40,211.90 : x
  2. Step 2: Convert to fraction form
    72,476.68/100,018.65 = 40,211.90/x
  3. Step 3: Cross multiply
    72,476.68x = 100,018.65 × 40,211.90
  4. Step 4: Simplify right side
    72,476.68x = 4,021,939,951.94
  5. Step 5: Solve for x
    x = 4,021,939,951.94/72,476.68
  6. Step 6: Final answer
    x = 55,492.88

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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.