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Finding the Fourth Proportional to 12,607.68, 18,911.70 and 5,212.20

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Solution

The fourth proportional to 12,607.68, 18,911.70 and 5,212.20 is: 7,818.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,607.68 : 18,911.70 = 5,212.20 : x
  2. Step 2: Convert to fraction form
    12,607.68/18,911.70 = 5,212.20/x
  3. Step 3: Cross multiply
    12,607.68x = 18,911.70 × 5,212.20
  4. Step 4: Simplify right side
    12,607.68x = 98,571,562.74
  5. Step 5: Solve for x
    x = 98,571,562.74/12,607.68
  6. Step 6: Final answer
    x = 7,818.37

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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.