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Finding the Fourth Proportional to 19,307.20, 28,912.20 and 12,697.60

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Solution

The fourth proportional to 19,307.20, 28,912.20 and 12,697.60 is: 19,014.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,307.20 : 28,912.20 = 12,697.60 : x
  2. Step 2: Convert to fraction form
    19,307.20/28,912.20 = 12,697.60/x
  3. Step 3: Cross multiply
    19,307.20x = 28,912.20 × 12,697.60
  4. Step 4: Simplify right side
    19,307.20x = 367,115,550.72
  5. Step 5: Solve for x
    x = 367,115,550.72/19,307.20
  6. Step 6: Final answer
    x = 19,014.44

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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.