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Finding the Fourth Proportional to 21,894.60, 32,789.28 and 12,506.20

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Solution

The fourth proportional to 21,894.60, 32,789.28 and 12,506.20 is: 18,729.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,894.60 : 32,789.28 = 12,506.20 : x
  2. Step 2: Convert to fraction form
    21,894.60/32,789.28 = 12,506.20/x
  3. Step 3: Cross multiply
    21,894.60x = 32,789.28 × 12,506.20
  4. Step 4: Simplify right side
    21,894.60x = 410,069,293.54
  5. Step 5: Solve for x
    x = 410,069,293.54/21,894.60
  6. Step 6: Final answer
    x = 18,729.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.