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Finding the Fourth Proportional to 129,351.88, 178,504.92 and 72,763.66

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Solution

The fourth proportional to 129,351.88, 178,504.92 and 72,763.66 is: 100,413.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,351.88 : 178,504.92 = 72,763.66 : x
  2. Step 2: Convert to fraction form
    129,351.88/178,504.92 = 72,763.66/x
  3. Step 3: Cross multiply
    129,351.88x = 178,504.92 × 72,763.66
  4. Step 4: Simplify right side
    129,351.88x = 12,988,671,307.21
  5. Step 5: Solve for x
    x = 12,988,671,307.21/129,351.88
  6. Step 6: Final answer
    x = 100,413.47

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1.5x scale

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.