Home / 20,915.79-28,863.61-12,422.08

Finding the Fourth Proportional to 20,915.79, 28,863.61 and 12,422.08

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Solution

The fourth proportional to 20,915.79, 28,863.61 and 12,422.08 is: 17,142.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.79 : 28,863.61 = 12,422.08 : x
  2. Step 2: Convert to fraction form
    20,915.79/28,863.61 = 12,422.08/x
  3. Step 3: Cross multiply
    20,915.79x = 28,863.61 × 12,422.08
  4. Step 4: Simplify right side
    20,915.79x = 358,546,072.51
  5. Step 5: Solve for x
    x = 358,546,072.51/20,915.79
  6. Step 6: Final answer
    x = 17,142.36

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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.