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Finding the Fourth Proportional to 71,148.70, 106,728.45 and 21,224.89

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Solution

The fourth proportional to 71,148.70, 106,728.45 and 21,224.89 is: 31,838.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,148.70 : 106,728.45 = 21,224.89 : x
  2. Step 2: Convert to fraction form
    71,148.70/106,728.45 = 21,224.89/x
  3. Step 3: Cross multiply
    71,148.70x = 106,728.45 × 21,224.89
  4. Step 4: Simplify right side
    71,148.70x = 2,265,299,611.12
  5. Step 5: Solve for x
    x = 2,265,299,611.12/71,148.70
  6. Step 6: Final answer
    x = 31,838.95

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1.5x scale

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.