Home / 12,938.73-17,855.20-8,157.70

Finding the Fourth Proportional to 12,938.73, 17,855.20 and 8,157.70

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Solution

The fourth proportional to 12,938.73, 17,855.20 and 8,157.70 is: 11,257.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,938.73 : 17,855.20 = 8,157.70 : x
  2. Step 2: Convert to fraction form
    12,938.73/17,855.20 = 8,157.70/x
  3. Step 3: Cross multiply
    12,938.73x = 17,855.20 × 8,157.70
  4. Step 4: Simplify right side
    12,938.73x = 145,657,365.04
  5. Step 5: Solve for x
    x = 145,657,365.04/12,938.73
  6. Step 6: Final answer
    x = 11,257.47

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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.