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Finding the Fourth Proportional to 12,405.70, 18,608.55 and 10,947.70

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Solution

The fourth proportional to 12,405.70, 18,608.55 and 10,947.70 is: 16,421.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.70 : 18,608.55 = 10,947.70 : x
  2. Step 2: Convert to fraction form
    12,405.70/18,608.55 = 10,947.70/x
  3. Step 3: Cross multiply
    12,405.70x = 18,608.55 × 10,947.70
  4. Step 4: Simplify right side
    12,405.70x = 203,720,822.84
  5. Step 5: Solve for x
    x = 203,720,822.84/12,405.70
  6. Step 6: Final answer
    x = 16,421.55

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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.