Home / 19,705.20-27,222.80-12,915.34

Finding the Fourth Proportional to 19,705.20, 27,222.80 and 12,915.34

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Solution

The fourth proportional to 19,705.20, 27,222.80 and 12,915.34 is: 17,842.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,705.20 : 27,222.80 = 12,915.34 : x
  2. Step 2: Convert to fraction form
    19,705.20/27,222.80 = 12,915.34/x
  3. Step 3: Cross multiply
    19,705.20x = 27,222.80 × 12,915.34
  4. Step 4: Simplify right side
    19,705.20x = 351,591,549.35
  5. Step 5: Solve for x
    x = 351,591,549.35/19,705.20
  6. Step 6: Final answer
    x = 17,842.57

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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.