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Finding the Fourth Proportional to 421,247.20, 631,870.80 and 210,857.80

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Solution

The fourth proportional to 421,247.20, 631,870.80 and 210,857.80 is: 316,286.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,247.20 : 631,870.80 = 210,857.80 : x
  2. Step 2: Convert to fraction form
    421,247.20/631,870.80 = 210,857.80/x
  3. Step 3: Cross multiply
    421,247.20x = 631,870.80 × 210,857.80
  4. Step 4: Simplify right side
    421,247.20x = 133,234,886,772.24
  5. Step 5: Solve for x
    x = 133,234,886,772.24/421,247.20
  6. Step 6: Final answer
    x = 316,286.70

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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.