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Finding the Fourth Proportional to 18,925.80, 28,388.70 and 16,811.70

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Solution

The fourth proportional to 18,925.80, 28,388.70 and 16,811.70 is: 25,217.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,925.80 : 28,388.70 = 16,811.70 : x
  2. Step 2: Convert to fraction form
    18,925.80/28,388.70 = 16,811.70/x
  3. Step 3: Cross multiply
    18,925.80x = 28,388.70 × 16,811.70
  4. Step 4: Simplify right side
    18,925.80x = 477,262,307.79
  5. Step 5: Solve for x
    x = 477,262,307.79/18,925.80
  6. Step 6: Final answer
    x = 25,217.55

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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.