Home / 21,890.18-30,220.89-14,459.78

Finding the Fourth Proportional to 21,890.18, 30,220.89 and 14,459.78

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Solution

The fourth proportional to 21,890.18, 30,220.89 and 14,459.78 is: 19,962.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,890.18 : 30,220.89 = 14,459.78 : x
  2. Step 2: Convert to fraction form
    21,890.18/30,220.89 = 14,459.78/x
  3. Step 3: Cross multiply
    21,890.18x = 30,220.89 × 14,459.78
  4. Step 4: Simplify right side
    21,890.18x = 436,987,420.80
  5. Step 5: Solve for x
    x = 436,987,420.80/21,890.18
  6. Step 6: Final answer
    x = 19,962.71

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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.