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Finding the Fourth Proportional to 21,329.60, 31,994.40 and 11,998.40

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Solution

The fourth proportional to 21,329.60, 31,994.40 and 11,998.40 is: 17,997.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,329.60 : 31,994.40 = 11,998.40 : x
  2. Step 2: Convert to fraction form
    21,329.60/31,994.40 = 11,998.40/x
  3. Step 3: Cross multiply
    21,329.60x = 31,994.40 × 11,998.40
  4. Step 4: Simplify right side
    21,329.60x = 383,881,608.96
  5. Step 5: Solve for x
    x = 383,881,608.96/21,329.60
  6. Step 6: Final answer
    x = 17,997.60

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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.