Home / 21,929.78-30,261.26-12,975.72

Finding the Fourth Proportional to 21,929.78, 30,261.26 and 12,975.72

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Solution

The fourth proportional to 21,929.78, 30,261.26 and 12,975.72 is: 17,905.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,929.78 : 30,261.26 = 12,975.72 : x
  2. Step 2: Convert to fraction form
    21,929.78/30,261.26 = 12,975.72/x
  3. Step 3: Cross multiply
    21,929.78x = 30,261.26 × 12,975.72
  4. Step 4: Simplify right side
    21,929.78x = 392,661,636.61
  5. Step 5: Solve for x
    x = 392,661,636.61/21,929.78
  6. Step 6: Final answer
    x = 17,905.41

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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.