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Finding the Fourth Proportional to 25,615.80, 38,423.70 and 7,147.80

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Solution

The fourth proportional to 25,615.80, 38,423.70 and 7,147.80 is: 10,721.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,615.80 : 38,423.70 = 7,147.80 : x
  2. Step 2: Convert to fraction form
    25,615.80/38,423.70 = 7,147.80/x
  3. Step 3: Cross multiply
    25,615.80x = 38,423.70 × 7,147.80
  4. Step 4: Simplify right side
    25,615.80x = 274,644,922.86
  5. Step 5: Solve for x
    x = 274,644,922.86/25,615.80
  6. Step 6: Final answer
    x = 10,721.70

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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.