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Finding the Fourth Proportional to 21,885.66, 30,204.18 and 12,454.74

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Solution

The fourth proportional to 21,885.66, 30,204.18 and 12,454.74 is: 17,188.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,885.66 : 30,204.18 = 12,454.74 : x
  2. Step 2: Convert to fraction form
    21,885.66/30,204.18 = 12,454.74/x
  3. Step 3: Cross multiply
    21,885.66x = 30,204.18 × 12,454.74
  4. Step 4: Simplify right side
    21,885.66x = 376,185,208.81
  5. Step 5: Solve for x
    x = 376,185,208.81/21,885.66
  6. Step 6: Final answer
    x = 17,188.66

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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.