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Finding the Fourth Proportional to 21,891.25, 30,210.65 and 11,955.25

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Solution

The fourth proportional to 21,891.25, 30,210.65 and 11,955.25 is: 16,498.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.25 : 30,210.65 = 11,955.25 : x
  2. Step 2: Convert to fraction form
    21,891.25/30,210.65 = 11,955.25/x
  3. Step 3: Cross multiply
    21,891.25x = 30,210.65 × 11,955.25
  4. Step 4: Simplify right side
    21,891.25x = 361,175,873.41
  5. Step 5: Solve for x
    x = 361,175,873.41/21,891.25
  6. Step 6: Final answer
    x = 16,498.64

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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.