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Finding the Fourth Proportional to 21,758.76, 30,035.34 and 12,806.64

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Solution

The fourth proportional to 21,758.76, 30,035.34 and 12,806.64 is: 17,678.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,758.76 : 30,035.34 = 12,806.64 : x
  2. Step 2: Convert to fraction form
    21,758.76/30,035.34 = 12,806.64/x
  3. Step 3: Cross multiply
    21,758.76x = 30,035.34 × 12,806.64
  4. Step 4: Simplify right side
    21,758.76x = 384,651,786.66
  5. Step 5: Solve for x
    x = 384,651,786.66/21,758.76
  6. Step 6: Final answer
    x = 17,678.02

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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.