Home / 21,360.16-29,460-13,399.84

Finding the Fourth Proportional to 21,360.16, 29,460 and 13,399.84

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Solution

The fourth proportional to 21,360.16, 29,460 and 13,399.84 is: 18,481.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,360.16 : 29,460 = 13,399.84 : x
  2. Step 2: Convert to fraction form
    21,360.16/29,460 = 13,399.84/x
  3. Step 3: Cross multiply
    21,360.16x = 29,460 × 13,399.84
  4. Step 4: Simplify right side
    21,360.16x = 394,759,286.40
  5. Step 5: Solve for x
    x = 394,759,286.40/21,360.16
  6. Step 6: Final answer
    x = 18,481.10

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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.