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Finding the Fourth Proportional to 12,666.53, 18,989.55 and 5,276.54

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Solution

The fourth proportional to 12,666.53, 18,989.55 and 5,276.54 is: 7,910.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,666.53 : 18,989.55 = 5,276.54 : x
  2. Step 2: Convert to fraction form
    12,666.53/18,989.55 = 5,276.54/x
  3. Step 3: Cross multiply
    12,666.53x = 18,989.55 × 5,276.54
  4. Step 4: Simplify right side
    12,666.53x = 100,199,147.84
  5. Step 5: Solve for x
    x = 100,199,147.84/12,666.53
  6. Step 6: Final answer
    x = 7,910.55

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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.