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Finding the Fourth Proportional to 39,879.40, 59,819.10 and 13,613.80

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Solution

The fourth proportional to 39,879.40, 59,819.10 and 13,613.80 is: 20,420.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,879.40 : 59,819.10 = 13,613.80 : x
  2. Step 2: Convert to fraction form
    39,879.40/59,819.10 = 13,613.80/x
  3. Step 3: Cross multiply
    39,879.40x = 59,819.10 × 13,613.80
  4. Step 4: Simplify right side
    39,879.40x = 814,365,263.58
  5. Step 5: Solve for x
    x = 814,365,263.58/39,879.40
  6. Step 6: Final answer
    x = 20,420.70

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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.