Home / 21,109.20-29,130.84-11,678.28

Finding the Fourth Proportional to 21,109.20, 29,130.84 and 11,678.28

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Solution

The fourth proportional to 21,109.20, 29,130.84 and 11,678.28 is: 16,116.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,109.20 : 29,130.84 = 11,678.28 : x
  2. Step 2: Convert to fraction form
    21,109.20/29,130.84 = 11,678.28/x
  3. Step 3: Cross multiply
    21,109.20x = 29,130.84 × 11,678.28
  4. Step 4: Simplify right side
    21,109.20x = 340,198,106.16
  5. Step 5: Solve for x
    x = 340,198,106.16/21,109.20
  6. Step 6: Final answer
    x = 16,116.11

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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.