Home / 21,838.35-30,135.62-12,888.66

Finding the Fourth Proportional to 21,838.35, 30,135.62 and 12,888.66

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Solution

The fourth proportional to 21,838.35, 30,135.62 and 12,888.66 is: 17,785.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,838.35 : 30,135.62 = 12,888.66 : x
  2. Step 2: Convert to fraction form
    21,838.35/30,135.62 = 12,888.66/x
  3. Step 3: Cross multiply
    21,838.35x = 30,135.62 × 12,888.66
  4. Step 4: Simplify right side
    21,838.35x = 388,407,695.63
  5. Step 5: Solve for x
    x = 388,407,695.63/21,838.35
  6. Step 6: Final answer
    x = 17,785.58

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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.