Home / 21,689.28-29,930.40-12,257.64

Finding the Fourth Proportional to 21,689.28, 29,930.40 and 12,257.64

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Solution

The fourth proportional to 21,689.28, 29,930.40 and 12,257.64 is: 16,915.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.28 : 29,930.40 = 12,257.64 : x
  2. Step 2: Convert to fraction form
    21,689.28/29,930.40 = 12,257.64/x
  3. Step 3: Cross multiply
    21,689.28x = 29,930.40 × 12,257.64
  4. Step 4: Simplify right side
    21,689.28x = 366,876,068.26
  5. Step 5: Solve for x
    x = 366,876,068.26/21,689.28
  6. Step 6: Final answer
    x = 16,915.09

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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.