Home / 20,783.13-28,680.72-11,351.71

Finding the Fourth Proportional to 20,783.13, 28,680.72 and 11,351.71

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Solution

The fourth proportional to 20,783.13, 28,680.72 and 11,351.71 is: 15,665.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783.13 : 28,680.72 = 11,351.71 : x
  2. Step 2: Convert to fraction form
    20,783.13/28,680.72 = 11,351.71/x
  3. Step 3: Cross multiply
    20,783.13x = 28,680.72 × 11,351.71
  4. Step 4: Simplify right side
    20,783.13x = 325,575,159.27
  5. Step 5: Solve for x
    x = 325,575,159.27/20,783.13
  6. Step 6: Final answer
    x = 15,665.36

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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.