Home / 21,678.32-29,915.45-12,118.22

Finding the Fourth Proportional to 21,678.32, 29,915.45 and 12,118.22

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Solution

The fourth proportional to 21,678.32, 29,915.45 and 12,118.22 is: 16,722.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,678.32 : 29,915.45 = 12,118.22 : x
  2. Step 2: Convert to fraction form
    21,678.32/29,915.45 = 12,118.22/x
  3. Step 3: Cross multiply
    21,678.32x = 29,915.45 × 12,118.22
  4. Step 4: Simplify right side
    21,678.32x = 362,521,794.33
  5. Step 5: Solve for x
    x = 362,521,794.33/21,678.32
  6. Step 6: Final answer
    x = 16,722.78

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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.