Home / 21,102.12-29,124.83-13,557.89

Finding the Fourth Proportional to 21,102.12, 29,124.83 and 13,557.89

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Solution

The fourth proportional to 21,102.12, 29,124.83 and 13,557.89 is: 18,712.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,102.12 : 29,124.83 = 13,557.89 : x
  2. Step 2: Convert to fraction form
    21,102.12/29,124.83 = 13,557.89/x
  3. Step 3: Cross multiply
    21,102.12x = 29,124.83 × 13,557.89
  4. Step 4: Simplify right side
    21,102.12x = 394,871,241.41
  5. Step 5: Solve for x
    x = 394,871,241.41/21,102.12
  6. Step 6: Final answer
    x = 18,712.40

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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.