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Finding the Fourth Proportional to 219,371, 329,056.55 and 79,129.61

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Solution

The fourth proportional to 219,371, 329,056.55 and 79,129.61 is: 118,694.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,371 : 329,056.55 = 79,129.61 : x
  2. Step 2: Convert to fraction form
    219,371/329,056.55 = 79,129.61/x
  3. Step 3: Cross multiply
    219,371x = 329,056.55 × 79,129.61
  4. Step 4: Simplify right side
    219,371x = 26,038,116,073.80
  5. Step 5: Solve for x
    x = 26,038,116,073.80/219,371
  6. Step 6: Final answer
    x = 118,694.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.