Home / 21,655.76-29,881.31-13,156.43

Finding the Fourth Proportional to 21,655.76, 29,881.31 and 13,156.43

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Solution

The fourth proportional to 21,655.76, 29,881.31 and 13,156.43 is: 18,153.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,655.76 : 29,881.31 = 13,156.43 : x
  2. Step 2: Convert to fraction form
    21,655.76/29,881.31 = 13,156.43/x
  3. Step 3: Cross multiply
    21,655.76x = 29,881.31 × 13,156.43
  4. Step 4: Simplify right side
    21,655.76x = 393,131,148.13
  5. Step 5: Solve for x
    x = 393,131,148.13/21,655.76
  6. Step 6: Final answer
    x = 18,153.66

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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.