Home / 21,215.91-29,278.88-11,784.47

Finding the Fourth Proportional to 21,215.91, 29,278.88 and 11,784.47

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Solution

The fourth proportional to 21,215.91, 29,278.88 and 11,784.47 is: 16,263.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215.91 : 29,278.88 = 11,784.47 : x
  2. Step 2: Convert to fraction form
    21,215.91/29,278.88 = 11,784.47/x
  3. Step 3: Cross multiply
    21,215.91x = 29,278.88 × 11,784.47
  4. Step 4: Simplify right side
    21,215.91x = 345,035,877.68
  5. Step 5: Solve for x
    x = 345,035,877.68/21,215.91
  6. Step 6: Final answer
    x = 16,263.07

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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.