Home / 21,105.78-29,125.98-12,723.90

Finding the Fourth Proportional to 21,105.78, 29,125.98 and 12,723.90

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Solution

The fourth proportional to 21,105.78, 29,125.98 and 12,723.90 is: 17,558.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,105.78 : 29,125.98 = 12,723.90 : x
  2. Step 2: Convert to fraction form
    21,105.78/29,125.98 = 12,723.90/x
  3. Step 3: Cross multiply
    21,105.78x = 29,125.98 × 12,723.90
  4. Step 4: Simplify right side
    21,105.78x = 370,596,056.92
  5. Step 5: Solve for x
    x = 370,596,056.92/21,105.78
  6. Step 6: Final answer
    x = 17,558.98

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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.