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Finding the Fourth Proportional to 512,600.70, 768,901.05 and 212,981.70

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Solution

The fourth proportional to 512,600.70, 768,901.05 and 212,981.70 is: 319,472.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    512,600.70 : 768,901.05 = 212,981.70 : x
  2. Step 2: Convert to fraction form
    512,600.70/768,901.05 = 212,981.70/x
  3. Step 3: Cross multiply
    512,600.70x = 768,901.05 × 212,981.70
  4. Step 4: Simplify right side
    512,600.70x = 163,761,852,760.79
  5. Step 5: Solve for x
    x = 163,761,852,760.79/512,600.70
  6. Step 6: Final answer
    x = 319,472.55

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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.