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Finding the Fourth Proportional to 21,922.61, 30,246.02 and 13,415.86

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Solution

The fourth proportional to 21,922.61, 30,246.02 and 13,415.86 is: 18,509.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,922.61 : 30,246.02 = 13,415.86 : x
  2. Step 2: Convert to fraction form
    21,922.61/30,246.02 = 13,415.86/x
  3. Step 3: Cross multiply
    21,922.61x = 30,246.02 × 13,415.86
  4. Step 4: Simplify right side
    21,922.61x = 405,776,369.88
  5. Step 5: Solve for x
    x = 405,776,369.88/21,922.61
  6. Step 6: Final answer
    x = 18,509.49

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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.