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Finding the Fourth Proportional to 21,888.58, 30,179.90 and 15,179.98

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Solution

The fourth proportional to 21,888.58, 30,179.90 and 15,179.98 is: 20,930.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,888.58 : 30,179.90 = 15,179.98 : x
  2. Step 2: Convert to fraction form
    21,888.58/30,179.90 = 15,179.98/x
  3. Step 3: Cross multiply
    21,888.58x = 30,179.90 × 15,179.98
  4. Step 4: Simplify right side
    21,888.58x = 458,130,278.40
  5. Step 5: Solve for x
    x = 458,130,278.40/21,888.58
  6. Step 6: Final answer
    x = 20,930.11

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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.