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Finding the Fourth Proportional to 20,208.90, 27,890.07 and 11,256.18

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Solution

The fourth proportional to 20,208.90, 27,890.07 and 11,256.18 is: 15,534.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,208.90 : 27,890.07 = 11,256.18 : x
  2. Step 2: Convert to fraction form
    20,208.90/27,890.07 = 11,256.18/x
  3. Step 3: Cross multiply
    20,208.90x = 27,890.07 × 11,256.18
  4. Step 4: Simplify right side
    20,208.90x = 313,935,648.13
  5. Step 5: Solve for x
    x = 313,935,648.13/20,208.90
  6. Step 6: Final answer
    x = 15,534.52

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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.