Home / 20,270.80-27,968.71-12,312.55

Finding the Fourth Proportional to 20,270.80, 27,968.71 and 12,312.55

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Solution

The fourth proportional to 20,270.80, 27,968.71 and 12,312.55 is: 16,988.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,270.80 : 27,968.71 = 12,312.55 : x
  2. Step 2: Convert to fraction form
    20,270.80/27,968.71 = 12,312.55/x
  3. Step 3: Cross multiply
    20,270.80x = 27,968.71 × 12,312.55
  4. Step 4: Simplify right side
    20,270.80x = 344,365,938.90
  5. Step 5: Solve for x
    x = 344,365,938.90/20,270.80
  6. Step 6: Final answer
    x = 16,988.28

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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.