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Finding the Fourth Proportional to 18,818.98, 28,228.49 and 4,780.06

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Solution

The fourth proportional to 18,818.98, 28,228.49 and 4,780.06 is: 7,170.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,818.98 : 28,228.49 = 4,780.06 : x
  2. Step 2: Convert to fraction form
    18,818.98/28,228.49 = 4,780.06/x
  3. Step 3: Cross multiply
    18,818.98x = 28,228.49 × 4,780.06
  4. Step 4: Simplify right side
    18,818.98x = 134,933,875.91
  5. Step 5: Solve for x
    x = 134,933,875.91/18,818.98
  6. Step 6: Final answer
    x = 7,170.10

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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.