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Finding the Fourth Proportional to 420,763.98, 631,330.95 and 221,037.96

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Solution

The fourth proportional to 420,763.98, 631,330.95 and 221,037.96 is: 331,654.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,763.98 : 631,330.95 = 221,037.96 : x
  2. Step 2: Convert to fraction form
    420,763.98/631,330.95 = 221,037.96/x
  3. Step 3: Cross multiply
    420,763.98x = 631,330.95 × 221,037.96
  4. Step 4: Simplify right side
    420,763.98x = 139,548,105,272.86
  5. Step 5: Solve for x
    x = 139,548,105,272.86/420,763.98
  6. Step 6: Final answer
    x = 331,654.11

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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.