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Finding the Fourth Proportional to 39,240.80, 58,861.20 and 20,808.80

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Solution

The fourth proportional to 39,240.80, 58,861.20 and 20,808.80 is: 31,213.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,240.80 : 58,861.20 = 20,808.80 : x
  2. Step 2: Convert to fraction form
    39,240.80/58,861.20 = 20,808.80/x
  3. Step 3: Cross multiply
    39,240.80x = 58,861.20 × 20,808.80
  4. Step 4: Simplify right side
    39,240.80x = 1,224,830,938.56
  5. Step 5: Solve for x
    x = 1,224,830,938.56/39,240.80
  6. Step 6: Final answer
    x = 31,213.20

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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.