Home / 20,430.72-30,645.45-5,640.54

Finding the Fourth Proportional to 20,430.72, 30,645.45 and 5,640.54

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Solution

The fourth proportional to 20,430.72, 30,645.45 and 5,640.54 is: 8,460.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.72 : 30,645.45 = 5,640.54 : x
  2. Step 2: Convert to fraction form
    20,430.72/30,645.45 = 5,640.54/x
  3. Step 3: Cross multiply
    20,430.72x = 30,645.45 × 5,640.54
  4. Step 4: Simplify right side
    20,430.72x = 172,856,886.54
  5. Step 5: Solve for x
    x = 172,856,886.54/20,430.72
  6. Step 6: Final answer
    x = 8,460.64

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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.