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Finding the Fourth Proportional to 20,390.71, 30,577.74 and 7,908.34

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Solution

The fourth proportional to 20,390.71, 30,577.74 and 7,908.34 is: 11,859.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.71 : 30,577.74 = 7,908.34 : x
  2. Step 2: Convert to fraction form
    20,390.71/30,577.74 = 7,908.34/x
  3. Step 3: Cross multiply
    20,390.71x = 30,577.74 × 7,908.34
  4. Step 4: Simplify right side
    20,390.71x = 241,819,164.35
  5. Step 5: Solve for x
    x = 241,819,164.35/20,390.71
  6. Step 6: Final answer
    x = 11,859.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.