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Finding the Fourth Proportional to 18,830.83, 28,211.82 and 8,817.21

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Solution

The fourth proportional to 18,830.83, 28,211.82 and 8,817.21 is: 13,209.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,830.83 : 28,211.82 = 8,817.21 : x
  2. Step 2: Convert to fraction form
    18,830.83/28,211.82 = 8,817.21/x
  3. Step 3: Cross multiply
    18,830.83x = 28,211.82 × 8,817.21
  4. Step 4: Simplify right side
    18,830.83x = 248,749,541.42
  5. Step 5: Solve for x
    x = 248,749,541.42/18,830.83
  6. Step 6: Final answer
    x = 13,209.70

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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.