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Finding the Fourth Proportional to 21,881.68, 30,194.88 and 12,928.72

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Solution

The fourth proportional to 21,881.68, 30,194.88 and 12,928.72 is: 17,840.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,881.68 : 30,194.88 = 12,928.72 : x
  2. Step 2: Convert to fraction form
    21,881.68/30,194.88 = 12,928.72/x
  3. Step 3: Cross multiply
    21,881.68x = 30,194.88 × 12,928.72
  4. Step 4: Simplify right side
    21,881.68x = 390,381,148.95
  5. Step 5: Solve for x
    x = 390,381,148.95/21,881.68
  6. Step 6: Final answer
    x = 17,840.55

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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.