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Finding the Fourth Proportional to 205,405.40, 308,108.10 and 72,435.80

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Solution

The fourth proportional to 205,405.40, 308,108.10 and 72,435.80 is: 108,653.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,405.40 : 308,108.10 = 72,435.80 : x
  2. Step 2: Convert to fraction form
    205,405.40/308,108.10 = 72,435.80/x
  3. Step 3: Cross multiply
    205,405.40x = 308,108.10 × 72,435.80
  4. Step 4: Simplify right side
    205,405.40x = 22,318,056,709.98
  5. Step 5: Solve for x
    x = 22,318,056,709.98/205,405.40
  6. Step 6: Final answer
    x = 108,653.70

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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.