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Finding the Fourth Proportional to 427,999.75, 641,998.14 and 128,479.12

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Solution

The fourth proportional to 427,999.75, 641,998.14 and 128,479.12 is: 192,718.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,999.75 : 641,998.14 = 128,479.12 : x
  2. Step 2: Convert to fraction form
    427,999.75/641,998.14 = 128,479.12/x
  3. Step 3: Cross multiply
    427,999.75x = 641,998.14 × 128,479.12
  4. Step 4: Simplify right side
    427,999.75x = 82,483,356,068.84
  5. Step 5: Solve for x
    x = 82,483,356,068.84/427,999.75
  6. Step 6: Final answer
    x = 192,718.23

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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.