Home / 21,420.89-29,560.82-11,989.45

Finding the Fourth Proportional to 21,420.89, 29,560.82 and 11,989.45

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Solution

The fourth proportional to 21,420.89, 29,560.82 and 11,989.45 is: 16,545.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420.89 : 29,560.82 = 11,989.45 : x
  2. Step 2: Convert to fraction form
    21,420.89/29,560.82 = 11,989.45/x
  3. Step 3: Cross multiply
    21,420.89x = 29,560.82 × 11,989.45
  4. Step 4: Simplify right side
    21,420.89x = 354,417,839.50
  5. Step 5: Solve for x
    x = 354,417,839.50/21,420.89
  6. Step 6: Final answer
    x = 16,545.43

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1.5x scale

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.