Home / 21,480.27-29,643.11-12,981.21

Finding the Fourth Proportional to 21,480.27, 29,643.11 and 12,981.21

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Solution

The fourth proportional to 21,480.27, 29,643.11 and 12,981.21 is: 17,914.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,480.27 : 29,643.11 = 12,981.21 : x
  2. Step 2: Convert to fraction form
    21,480.27/29,643.11 = 12,981.21/x
  3. Step 3: Cross multiply
    21,480.27x = 29,643.11 × 12,981.21
  4. Step 4: Simplify right side
    21,480.27x = 384,803,371.06
  5. Step 5: Solve for x
    x = 384,803,371.06/21,480.27
  6. Step 6: Final answer
    x = 17,914.27

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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.