Home / 427,021.32-640,314.36-142,609.56

Finding the Fourth Proportional to 427,021.32, 640,314.36 and 142,609.56

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Solution

The fourth proportional to 427,021.32, 640,314.36 and 142,609.56 is: 213,841.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,021.32 : 640,314.36 = 142,609.56 : x
  2. Step 2: Convert to fraction form
    427,021.32/640,314.36 = 142,609.56/x
  3. Step 3: Cross multiply
    427,021.32x = 640,314.36 × 142,609.56
  4. Step 4: Simplify right side
    427,021.32x = 91,314,949,141.28
  5. Step 5: Solve for x
    x = 91,314,949,141.28/427,021.32
  6. Step 6: Final answer
    x = 213,841.66

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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.