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Finding the Fourth Proportional to 21,907.65, 30,245.94 and 14,258.21

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Solution

The fourth proportional to 21,907.65, 30,245.94 and 14,258.21 is: 19,685.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,907.65 : 30,245.94 = 14,258.21 : x
  2. Step 2: Convert to fraction form
    21,907.65/30,245.94 = 14,258.21/x
  3. Step 3: Cross multiply
    21,907.65x = 30,245.94 × 14,258.21
  4. Step 4: Simplify right side
    21,907.65x = 431,252,964.17
  5. Step 5: Solve for x
    x = 431,252,964.17/21,907.65
  6. Step 6: Final answer
    x = 19,685.04

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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.