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Finding the Fourth Proportional to 21,329.74, 31,994.78 and 13,980.74

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Solution

The fourth proportional to 21,329.74, 31,994.78 and 13,980.74 is: 20,971.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,329.74 : 31,994.78 = 13,980.74 : x
  2. Step 2: Convert to fraction form
    21,329.74/31,994.78 = 13,980.74/x
  3. Step 3: Cross multiply
    21,329.74x = 31,994.78 × 13,980.74
  4. Step 4: Simplify right side
    21,329.74x = 447,310,743.26
  5. Step 5: Solve for x
    x = 447,310,743.26/21,329.74
  6. Step 6: Final answer
    x = 20,971.22

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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.