Home / 20,857.72-28,783.98-11,425.66

Finding the Fourth Proportional to 20,857.72, 28,783.98 and 11,425.66

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Solution

The fourth proportional to 20,857.72, 28,783.98 and 11,425.66 is: 15,767.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.72 : 28,783.98 = 11,425.66 : x
  2. Step 2: Convert to fraction form
    20,857.72/28,783.98 = 11,425.66/x
  3. Step 3: Cross multiply
    20,857.72x = 28,783.98 × 11,425.66
  4. Step 4: Simplify right side
    20,857.72x = 328,875,968.93
  5. Step 5: Solve for x
    x = 328,875,968.93/20,857.72
  6. Step 6: Final answer
    x = 15,767.59

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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.