Home / 21,138.07-31,679.55-11,777.71

Finding the Fourth Proportional to 21,138.07, 31,679.55 and 11,777.71

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Solution

The fourth proportional to 21,138.07, 31,679.55 and 11,777.71 is: 17,651.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.07 : 31,679.55 = 11,777.71 : x
  2. Step 2: Convert to fraction form
    21,138.07/31,679.55 = 11,777.71/x
  3. Step 3: Cross multiply
    21,138.07x = 31,679.55 × 11,777.71
  4. Step 4: Simplify right side
    21,138.07x = 373,112,552.83
  5. Step 5: Solve for x
    x = 373,112,552.83/21,138.07
  6. Step 6: Final answer
    x = 17,651.21

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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.