Home / 21,638.84-29,877.42-13,986.64

Finding the Fourth Proportional to 21,638.84, 29,877.42 and 13,986.64

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Solution

The fourth proportional to 21,638.84, 29,877.42 and 13,986.64 is: 19,311.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,638.84 : 29,877.42 = 13,986.64 : x
  2. Step 2: Convert to fraction form
    21,638.84/29,877.42 = 13,986.64/x
  3. Step 3: Cross multiply
    21,638.84x = 29,877.42 × 13,986.64
  4. Step 4: Simplify right side
    21,638.84x = 417,884,717.67
  5. Step 5: Solve for x
    x = 417,884,717.67/21,638.84
  6. Step 6: Final answer
    x = 19,311.79

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1.5x scale

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.