Home / 21,371.40-29,492.10-12,990.60

Finding the Fourth Proportional to 21,371.40, 29,492.10 and 12,990.60

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Solution

The fourth proportional to 21,371.40, 29,492.10 and 12,990.60 is: 17,926.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,371.40 : 29,492.10 = 12,990.60 : x
  2. Step 2: Convert to fraction form
    21,371.40/29,492.10 = 12,990.60/x
  3. Step 3: Cross multiply
    21,371.40x = 29,492.10 × 12,990.60
  4. Step 4: Simplify right side
    21,371.40x = 383,120,074.26
  5. Step 5: Solve for x
    x = 383,120,074.26/21,371.40
  6. Step 6: Final answer
    x = 17,926.77

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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.