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Finding the Fourth Proportional to 72,210.84, 99,653.67 and 40,379.66

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Solution

The fourth proportional to 72,210.84, 99,653.67 and 40,379.66 is: 55,725.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,210.84 : 99,653.67 = 40,379.66 : x
  2. Step 2: Convert to fraction form
    72,210.84/99,653.67 = 40,379.66/x
  3. Step 3: Cross multiply
    72,210.84x = 99,653.67 × 40,379.66
  4. Step 4: Simplify right side
    72,210.84x = 4,023,981,561.49
  5. Step 5: Solve for x
    x = 4,023,981,561.49/72,210.84
  6. Step 6: Final answer
    x = 55,725.45

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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.