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Finding the Fourth Proportional to 427,581.16, 641,191.30 and 128,104.32

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Solution

The fourth proportional to 427,581.16, 641,191.30 and 128,104.32 is: 192,102.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,581.16 : 641,191.30 = 128,104.32 : x
  2. Step 2: Convert to fraction form
    427,581.16/641,191.30 = 128,104.32/x
  3. Step 3: Cross multiply
    427,581.16x = 641,191.30 × 128,104.32
  4. Step 4: Simplify right side
    427,581.16x = 82,139,375,476.42
  5. Step 5: Solve for x
    x = 82,139,375,476.42/427,581.16
  6. Step 6: Final answer
    x = 192,102.42

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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.