Home / 21,419.78-29,559.96-11,988.32

Finding the Fourth Proportional to 21,419.78, 29,559.96 and 11,988.32

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Solution

The fourth proportional to 21,419.78, 29,559.96 and 11,988.32 is: 16,544.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,419.78 : 29,559.96 = 11,988.32 : x
  2. Step 2: Convert to fraction form
    21,419.78/29,559.96 = 11,988.32/x
  3. Step 3: Cross multiply
    21,419.78x = 29,559.96 × 11,988.32
  4. Step 4: Simplify right side
    21,419.78x = 354,374,259.67
  5. Step 5: Solve for x
    x = 354,374,259.67/21,419.78
  6. Step 6: Final answer
    x = 16,544.25

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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.