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Finding the Fourth Proportional to 18,818.98, 28,228.47 and 5,671.78

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Solution

The fourth proportional to 18,818.98, 28,228.47 and 5,671.78 is: 8,507.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,818.98 : 28,228.47 = 5,671.78 : x
  2. Step 2: Convert to fraction form
    18,818.98/28,228.47 = 5,671.78/x
  3. Step 3: Cross multiply
    18,818.98x = 28,228.47 × 5,671.78
  4. Step 4: Simplify right side
    18,818.98x = 160,105,671.58
  5. Step 5: Solve for x
    x = 160,105,671.58/18,818.98
  6. Step 6: Final answer
    x = 8,507.67

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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.