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Finding the Fourth Proportional to 25,668.39, 38,503.95 and 8,139.60

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Solution

The fourth proportional to 25,668.39, 38,503.95 and 8,139.60 is: 12,209.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,668.39 : 38,503.95 = 8,139.60 : x
  2. Step 2: Convert to fraction form
    25,668.39/38,503.95 = 8,139.60/x
  3. Step 3: Cross multiply
    25,668.39x = 38,503.95 × 8,139.60
  4. Step 4: Simplify right side
    25,668.39x = 313,406,751.42
  5. Step 5: Solve for x
    x = 313,406,751.42/25,668.39
  6. Step 6: Final answer
    x = 12,209.83

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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.