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Finding the Fourth Proportional to 39,252.80, 58,879.20 and 20,820.80

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Solution

The fourth proportional to 39,252.80, 58,879.20 and 20,820.80 is: 31,231.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,252.80 : 58,879.20 = 20,820.80 : x
  2. Step 2: Convert to fraction form
    39,252.80/58,879.20 = 20,820.80/x
  3. Step 3: Cross multiply
    39,252.80x = 58,879.20 × 20,820.80
  4. Step 4: Simplify right side
    39,252.80x = 1,225,912,047.36
  5. Step 5: Solve for x
    x = 1,225,912,047.36/39,252.80
  6. Step 6: Final answer
    x = 31,231.20

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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.