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Finding the Fourth Proportional to 421,279.80, 631,919.70 and 388,474.80

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Solution

The fourth proportional to 421,279.80, 631,919.70 and 388,474.80 is: 582,712.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,279.80 : 631,919.70 = 388,474.80 : x
  2. Step 2: Convert to fraction form
    421,279.80/631,919.70 = 388,474.80/x
  3. Step 3: Cross multiply
    421,279.80x = 631,919.70 × 388,474.80
  4. Step 4: Simplify right side
    421,279.80x = 245,484,879,073.56
  5. Step 5: Solve for x
    x = 245,484,879,073.56/421,279.80
  6. Step 6: Final answer
    x = 582,712.20

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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.