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Finding the Fourth Proportional to 18,977.40, 28,466.10 and 6,665.40

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Solution

The fourth proportional to 18,977.40, 28,466.10 and 6,665.40 is: 9,998.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,977.40 : 28,466.10 = 6,665.40 : x
  2. Step 2: Convert to fraction form
    18,977.40/28,466.10 = 6,665.40/x
  3. Step 3: Cross multiply
    18,977.40x = 28,466.10 × 6,665.40
  4. Step 4: Simplify right side
    18,977.40x = 189,737,942.94
  5. Step 5: Solve for x
    x = 189,737,942.94/18,977.40
  6. Step 6: Final answer
    x = 9,998.10

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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.