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Finding the Fourth Proportional to 421,208.80, 631,813.20 and 421,208.80

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Solution

The fourth proportional to 421,208.80, 631,813.20 and 421,208.80 is: 631,813.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,208.80 : 631,813.20 = 421,208.80 : x
  2. Step 2: Convert to fraction form
    421,208.80/631,813.20 = 421,208.80/x
  3. Step 3: Cross multiply
    421,208.80x = 631,813.20 × 421,208.80
  4. Step 4: Simplify right side
    421,208.80x = 266,125,279,796.16
  5. Step 5: Solve for x
    x = 266,125,279,796.16/421,208.80
  6. Step 6: Final answer
    x = 631,813.20

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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.