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Finding the Fourth Proportional to 20,395.79, 30,590.03 and 12,978.21

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Solution

The fourth proportional to 20,395.79, 30,590.03 and 12,978.21 is: 19,464.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,395.79 : 30,590.03 = 12,978.21 : x
  2. Step 2: Convert to fraction form
    20,395.79/30,590.03 = 12,978.21/x
  3. Step 3: Cross multiply
    20,395.79x = 30,590.03 × 12,978.21
  4. Step 4: Simplify right side
    20,395.79x = 397,003,768.36
  5. Step 5: Solve for x
    x = 397,003,768.36/20,395.79
  6. Step 6: Final answer
    x = 19,464.99

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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.