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Finding the Fourth Proportional to 129,804.35, 179,129.62 and 72,443.07

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Solution

The fourth proportional to 129,804.35, 179,129.62 and 72,443.07 is: 99,971.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,804.35 : 179,129.62 = 72,443.07 : x
  2. Step 2: Convert to fraction form
    129,804.35/179,129.62 = 72,443.07/x
  3. Step 3: Cross multiply
    129,804.35x = 179,129.62 × 72,443.07
  4. Step 4: Simplify right side
    129,804.35x = 12,976,699,600.73
  5. Step 5: Solve for x
    x = 12,976,699,600.73/129,804.35
  6. Step 6: Final answer
    x = 99,971.22

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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.