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Finding the Fourth Proportional to 128,981.70, 193,472.55 and 34,211.70

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Solution

The fourth proportional to 128,981.70, 193,472.55 and 34,211.70 is: 51,317.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,981.70 : 193,472.55 = 34,211.70 : x
  2. Step 2: Convert to fraction form
    128,981.70/193,472.55 = 34,211.70/x
  3. Step 3: Cross multiply
    128,981.70x = 193,472.55 × 34,211.70
  4. Step 4: Simplify right side
    128,981.70x = 6,619,024,838.84
  5. Step 5: Solve for x
    x = 6,619,024,838.84/128,981.70
  6. Step 6: Final answer
    x = 51,317.55

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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.