Home / 21,388.20-29,515.51-11,828.51

Finding the Fourth Proportional to 21,388.20, 29,515.51 and 11,828.51

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Solution

The fourth proportional to 21,388.20, 29,515.51 and 11,828.51 is: 16,323.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,388.20 : 29,515.51 = 11,828.51 : x
  2. Step 2: Convert to fraction form
    21,388.20/29,515.51 = 11,828.51/x
  3. Step 3: Cross multiply
    21,388.20x = 29,515.51 × 11,828.51
  4. Step 4: Simplify right side
    21,388.20x = 349,124,505.19
  5. Step 5: Solve for x
    x = 349,124,505.19/21,388.20
  6. Step 6: Final answer
    x = 16,323.23

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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.