Home / 21,287.61-29,377.49-11,856.78

Finding the Fourth Proportional to 21,287.61, 29,377.49 and 11,856.78

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Solution

The fourth proportional to 21,287.61, 29,377.49 and 11,856.78 is: 16,362.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,287.61 : 29,377.49 = 11,856.78 : x
  2. Step 2: Convert to fraction form
    21,287.61/29,377.49 = 11,856.78/x
  3. Step 3: Cross multiply
    21,287.61x = 29,377.49 × 11,856.78
  4. Step 4: Simplify right side
    21,287.61x = 348,322,376.60
  5. Step 5: Solve for x
    x = 348,322,376.60/21,287.61
  6. Step 6: Final answer
    x = 16,362.68

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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.