Home / 20,128.10-30,170.55-7,643.30

Finding the Fourth Proportional to 20,128.10, 30,170.55 and 7,643.30

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Solution

The fourth proportional to 20,128.10, 30,170.55 and 7,643.30 is: 11,456.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.10 : 30,170.55 = 7,643.30 : x
  2. Step 2: Convert to fraction form
    20,128.10/30,170.55 = 7,643.30/x
  3. Step 3: Cross multiply
    20,128.10x = 30,170.55 × 7,643.30
  4. Step 4: Simplify right side
    20,128.10x = 230,602,564.82
  5. Step 5: Solve for x
    x = 230,602,564.82/20,128.10
  6. Step 6: Final answer
    x = 11,456.75

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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.