Home / 420,875,999.20-631,313,998.80-318,839,327.20

Finding the Fourth Proportional to 420,875,999.20, 631,313,998.80 and 318,839,327.20

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Solution

The fourth proportional to 420,875,999.20, 631,313,998.80 and 318,839,327.20 is: 478,258,990.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,875,999.20 : 631,313,998.80 = 318,839,327.20 : x
  2. Step 2: Convert to fraction form
    420,875,999.20/631,313,998.80 = 318,839,327.20/x
  3. Step 3: Cross multiply
    420,875,999.20x = 631,313,998.80 × 318,839,327.20
  4. Step 4: Simplify right side
    420,875,999.20x = 201,287,730,629,333,600
  5. Step 5: Solve for x
    x = 201,287,730,629,333,600/420,875,999.20
  6. Step 6: Final answer
    x = 478,258,990.80

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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.