Home / 21,138.56-29,144.68-13,571.52

Finding the Fourth Proportional to 21,138.56, 29,144.68 and 13,571.52

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Solution

The fourth proportional to 21,138.56, 29,144.68 and 13,571.52 is: 18,711.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.56 : 29,144.68 = 13,571.52 : x
  2. Step 2: Convert to fraction form
    21,138.56/29,144.68 = 13,571.52/x
  3. Step 3: Cross multiply
    21,138.56x = 29,144.68 × 13,571.52
  4. Step 4: Simplify right side
    21,138.56x = 395,537,607.51
  5. Step 5: Solve for x
    x = 395,537,607.51/21,138.56
  6. Step 6: Final answer
    x = 18,711.66

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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.