Home / 21,905.10-30,243.60-16,860.42

Finding the Fourth Proportional to 21,905.10, 30,243.60 and 16,860.42

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Solution

The fourth proportional to 21,905.10, 30,243.60 and 16,860.42 is: 23,278.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,905.10 : 30,243.60 = 16,860.42 : x
  2. Step 2: Convert to fraction form
    21,905.10/30,243.60 = 16,860.42/x
  3. Step 3: Cross multiply
    21,905.10x = 30,243.60 × 16,860.42
  4. Step 4: Simplify right side
    21,905.10x = 509,919,798.31
  5. Step 5: Solve for x
    x = 509,919,798.31/21,905.10
  6. Step 6: Final answer
    x = 23,278.59

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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.