Home / 21,107.43-29,128.55-12,156.53

Finding the Fourth Proportional to 21,107.43, 29,128.55 and 12,156.53

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Solution

The fourth proportional to 21,107.43, 29,128.55 and 12,156.53 is: 16,776.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,107.43 : 29,128.55 = 12,156.53 : x
  2. Step 2: Convert to fraction form
    21,107.43/29,128.55 = 12,156.53/x
  3. Step 3: Cross multiply
    21,107.43x = 29,128.55 × 12,156.53
  4. Step 4: Simplify right side
    21,107.43x = 354,101,885.51
  5. Step 5: Solve for x
    x = 354,101,885.51/21,107.43
  6. Step 6: Final answer
    x = 16,776.17

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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.