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Finding the Fourth Proportional to 129,771.84, 179,085.69 and 72,413.67

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Solution

The fourth proportional to 129,771.84, 179,085.69 and 72,413.67 is: 99,931.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,771.84 : 179,085.69 = 72,413.67 : x
  2. Step 2: Convert to fraction form
    129,771.84/179,085.69 = 72,413.67/x
  3. Step 3: Cross multiply
    129,771.84x = 179,085.69 × 72,413.67
  4. Step 4: Simplify right side
    129,771.84x = 12,968,251,161.95
  5. Step 5: Solve for x
    x = 12,968,251,161.95/129,771.84
  6. Step 6: Final answer
    x = 99,931.17

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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.