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Finding the Fourth Proportional to 13,706.78, 18,915.40 and 7,419.20

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Solution

The fourth proportional to 13,706.78, 18,915.40 and 7,419.20 is: 10,238.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,706.78 : 18,915.40 = 7,419.20 : x
  2. Step 2: Convert to fraction form
    13,706.78/18,915.40 = 7,419.20/x
  3. Step 3: Cross multiply
    13,706.78x = 18,915.40 × 7,419.20
  4. Step 4: Simplify right side
    13,706.78x = 140,337,135.68
  5. Step 5: Solve for x
    x = 140,337,135.68/13,706.78
  6. Step 6: Final answer
    x = 10,238.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.