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Finding the Fourth Proportional to 427,940.01, 641,817.07 and 128,340.15

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Solution

The fourth proportional to 427,940.01, 641,817.07 and 128,340.15 is: 192,482.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,940.01 : 641,817.07 = 128,340.15 : x
  2. Step 2: Convert to fraction form
    427,940.01/641,817.07 = 128,340.15/x
  3. Step 3: Cross multiply
    427,940.01x = 641,817.07 × 128,340.15
  4. Step 4: Simplify right side
    427,940.01x = 82,370,896,308.70
  5. Step 5: Solve for x
    x = 82,370,896,308.70/427,940.01
  6. Step 6: Final answer
    x = 192,482.34

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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.