Home / 21,721.64-29,971.68-12,288.38

Finding the Fourth Proportional to 21,721.64, 29,971.68 and 12,288.38

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Solution

The fourth proportional to 21,721.64, 29,971.68 and 12,288.38 is: 16,955.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.64 : 29,971.68 = 12,288.38 : x
  2. Step 2: Convert to fraction form
    21,721.64/29,971.68 = 12,288.38/x
  3. Step 3: Cross multiply
    21,721.64x = 29,971.68 × 12,288.38
  4. Step 4: Simplify right side
    21,721.64x = 368,303,393.08
  5. Step 5: Solve for x
    x = 368,303,393.08/21,721.64
  6. Step 6: Final answer
    x = 16,955.60

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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.