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Finding the Fourth Proportional to 421,069.60, 631,604.40 and 243,485.20

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Solution

The fourth proportional to 421,069.60, 631,604.40 and 243,485.20 is: 365,227.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,069.60 : 631,604.40 = 243,485.20 : x
  2. Step 2: Convert to fraction form
    421,069.60/631,604.40 = 243,485.20/x
  3. Step 3: Cross multiply
    421,069.60x = 631,604.40 × 243,485.20
  4. Step 4: Simplify right side
    421,069.60x = 153,786,323,654.88
  5. Step 5: Solve for x
    x = 153,786,323,654.88/421,069.60
  6. Step 6: Final answer
    x = 365,227.80

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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.