Home / 129,021.84-178,040.32-72,422.28

Finding the Fourth Proportional to 129,021.84, 178,040.32 and 72,422.28

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Solution

The fourth proportional to 129,021.84, 178,040.32 and 72,422.28 is: 99,937.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,021.84 : 178,040.32 = 72,422.28 : x
  2. Step 2: Convert to fraction form
    129,021.84/178,040.32 = 72,422.28/x
  3. Step 3: Cross multiply
    129,021.84x = 178,040.32 × 72,422.28
  4. Step 4: Simplify right side
    129,021.84x = 12,894,085,906.33
  5. Step 5: Solve for x
    x = 12,894,085,906.33/129,021.84
  6. Step 6: Final answer
    x = 99,937.23

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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.