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Finding the Fourth Proportional to 20,620, 30,987.60 and 19,292.32

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Solution

The fourth proportional to 20,620, 30,987.60 and 19,292.32 is: 28,992.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620 : 30,987.60 = 19,292.32 : x
  2. Step 2: Convert to fraction form
    20,620/30,987.60 = 19,292.32/x
  3. Step 3: Cross multiply
    20,620x = 30,987.60 × 19,292.32
  4. Step 4: Simplify right side
    20,620x = 597,822,695.23
  5. Step 5: Solve for x
    x = 597,822,695.23/20,620
  6. Step 6: Final answer
    x = 28,992.37

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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.