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Finding the Fourth Proportional to 12,420.20, 18,608.70 and 10,476.20

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Solution

The fourth proportional to 12,420.20, 18,608.70 and 10,476.20 is: 15,696.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.20 : 18,608.70 = 10,476.20 : x
  2. Step 2: Convert to fraction form
    12,420.20/18,608.70 = 10,476.20/x
  3. Step 3: Cross multiply
    12,420.20x = 18,608.70 × 10,476.20
  4. Step 4: Simplify right side
    12,420.20x = 194,948,462.94
  5. Step 5: Solve for x
    x = 194,948,462.94/12,420.20
  6. Step 6: Final answer
    x = 15,696.08

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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.