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Finding the Fourth Proportional to 268,420.70, 402,285.45 and 205,780.70

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Solution

The fourth proportional to 268,420.70, 402,285.45 and 205,780.70 is: 308,406.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,420.70 : 402,285.45 = 205,780.70 : x
  2. Step 2: Convert to fraction form
    268,420.70/402,285.45 = 205,780.70/x
  3. Step 3: Cross multiply
    268,420.70x = 402,285.45 × 205,780.70
  4. Step 4: Simplify right side
    268,420.70x = 82,782,581,500.82
  5. Step 5: Solve for x
    x = 82,782,581,500.82/268,420.70
  6. Step 6: Final answer
    x = 308,406.10

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1.5x scale

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.