Home / 21,647.81-29,876.43-12,215.63

Finding the Fourth Proportional to 21,647.81, 29,876.43 and 12,215.63

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Solution

The fourth proportional to 21,647.81, 29,876.43 and 12,215.63 is: 16,858.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,647.81 : 29,876.43 = 12,215.63 : x
  2. Step 2: Convert to fraction form
    21,647.81/29,876.43 = 12,215.63/x
  3. Step 3: Cross multiply
    21,647.81x = 29,876.43 × 12,215.63
  4. Step 4: Simplify right side
    21,647.81x = 364,959,265.22
  5. Step 5: Solve for x
    x = 364,959,265.22/21,647.81
  6. Step 6: Final answer
    x = 16,858.95

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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.