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Finding the Fourth Proportional to 21,718.80, 29,971.80 and 12,287.16

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Solution

The fourth proportional to 21,718.80, 29,971.80 and 12,287.16 is: 16,956.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,718.80 : 29,971.80 = 12,287.16 : x
  2. Step 2: Convert to fraction form
    21,718.80/29,971.80 = 12,287.16/x
  3. Step 3: Cross multiply
    21,718.80x = 29,971.80 × 12,287.16
  4. Step 4: Simplify right side
    21,718.80x = 368,268,302.09
  5. Step 5: Solve for x
    x = 368,268,302.09/21,718.80
  6. Step 6: Final answer
    x = 16,956.20

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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.