Home / 21,366.90-29,485.89-12,986.10

Finding the Fourth Proportional to 21,366.90, 29,485.89 and 12,986.10

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Solution

The fourth proportional to 21,366.90, 29,485.89 and 12,986.10 is: 17,920.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,366.90 : 29,485.89 = 12,986.10 : x
  2. Step 2: Convert to fraction form
    21,366.90/29,485.89 = 12,986.10/x
  3. Step 3: Cross multiply
    21,366.90x = 29,485.89 × 12,986.10
  4. Step 4: Simplify right side
    21,366.90x = 382,906,716.13
  5. Step 5: Solve for x
    x = 382,906,716.13/21,366.90
  6. Step 6: Final answer
    x = 17,920.56

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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.