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Finding the Fourth Proportional to 421,206.80, 631,810.20 and 168,608.30

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Solution

The fourth proportional to 421,206.80, 631,810.20 and 168,608.30 is: 252,912.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,206.80 : 631,810.20 = 168,608.30 : x
  2. Step 2: Convert to fraction form
    421,206.80/631,810.20 = 168,608.30/x
  3. Step 3: Cross multiply
    421,206.80x = 631,810.20 × 168,608.30
  4. Step 4: Simplify right side
    421,206.80x = 106,528,443,744.66
  5. Step 5: Solve for x
    x = 106,528,443,744.66/421,206.80
  6. Step 6: Final answer
    x = 252,912.45

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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.