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Finding the Fourth Proportional to 18,681.90, 28,027.80 and 8,147.40

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Solution

The fourth proportional to 18,681.90, 28,027.80 and 8,147.40 is: 12,223.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,681.90 : 28,027.80 = 8,147.40 : x
  2. Step 2: Convert to fraction form
    18,681.90/28,027.80 = 8,147.40/x
  3. Step 3: Cross multiply
    18,681.90x = 28,027.80 × 8,147.40
  4. Step 4: Simplify right side
    18,681.90x = 228,353,697.72
  5. Step 5: Solve for x
    x = 228,353,697.72/18,681.90
  6. Step 6: Final answer
    x = 12,223.26

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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.