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Finding the Fourth Proportional to 427,998.25, 641,995.89 and 128,477.62

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Solution

The fourth proportional to 427,998.25, 641,995.89 and 128,477.62 is: 192,715.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,998.25 : 641,995.89 = 128,477.62 : x
  2. Step 2: Convert to fraction form
    427,998.25/641,995.89 = 128,477.62/x
  3. Step 3: Cross multiply
    427,998.25x = 641,995.89 × 128,477.62
  4. Step 4: Simplify right side
    427,998.25x = 82,482,103,996.98
  5. Step 5: Solve for x
    x = 82,482,103,996.98/427,998.25
  6. Step 6: Final answer
    x = 192,715.98

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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.