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Finding the Fourth Proportional to 21,889.68, 30,220.20 and 14,459.28

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Solution

The fourth proportional to 21,889.68, 30,220.20 and 14,459.28 is: 19,962.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,889.68 : 30,220.20 = 14,459.28 : x
  2. Step 2: Convert to fraction form
    21,889.68/30,220.20 = 14,459.28/x
  3. Step 3: Cross multiply
    21,889.68x = 30,220.20 × 14,459.28
  4. Step 4: Simplify right side
    21,889.68x = 436,962,333.46
  5. Step 5: Solve for x
    x = 436,962,333.46/21,889.68
  6. Step 6: Final answer
    x = 19,962.02

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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.