Home / 21,108.78-29,128.58-11,677.50

Finding the Fourth Proportional to 21,108.78, 29,128.58 and 11,677.50

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Solution

The fourth proportional to 21,108.78, 29,128.58 and 11,677.50 is: 16,114.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.78 : 29,128.58 = 11,677.50 : x
  2. Step 2: Convert to fraction form
    21,108.78/29,128.58 = 11,677.50/x
  3. Step 3: Cross multiply
    21,108.78x = 29,128.58 × 11,677.50
  4. Step 4: Simplify right side
    21,108.78x = 340,148,992.95
  5. Step 5: Solve for x
    x = 340,148,992.95/21,108.78
  6. Step 6: Final answer
    x = 16,114.10

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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.