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Finding the Fourth Proportional to 420,765.98, 631,333.95 and 221,039.96

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Solution

The fourth proportional to 420,765.98, 631,333.95 and 221,039.96 is: 331,657.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,765.98 : 631,333.95 = 221,039.96 : x
  2. Step 2: Convert to fraction form
    420,765.98/631,333.95 = 221,039.96/x
  3. Step 3: Cross multiply
    420,765.98x = 631,333.95 × 221,039.96
  4. Step 4: Simplify right side
    420,765.98x = 139,550,031,054.64
  5. Step 5: Solve for x
    x = 139,550,031,054.64/420,765.98
  6. Step 6: Final answer
    x = 331,657.12

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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.