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Finding the Fourth Proportional to 72,486.28, 100,034.82 and 40,653.40

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Solution

The fourth proportional to 72,486.28, 100,034.82 and 40,653.40 is: 56,103.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,486.28 : 100,034.82 = 40,653.40 : x
  2. Step 2: Convert to fraction form
    72,486.28/100,034.82 = 40,653.40/x
  3. Step 3: Cross multiply
    72,486.28x = 100,034.82 × 40,653.40
  4. Step 4: Simplify right side
    72,486.28x = 4,066,755,551.39
  5. Step 5: Solve for x
    x = 4,066,755,551.39/72,486.28
  6. Step 6: Final answer
    x = 56,103.80

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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.