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Finding the Fourth Proportional to 30,690.63, 45,962.10 and 20,799.90

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Solution

The fourth proportional to 30,690.63, 45,962.10 and 20,799.90 is: 31,149.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,690.63 : 45,962.10 = 20,799.90 : x
  2. Step 2: Convert to fraction form
    30,690.63/45,962.10 = 20,799.90/x
  3. Step 3: Cross multiply
    30,690.63x = 45,962.10 × 20,799.90
  4. Step 4: Simplify right side
    30,690.63x = 956,007,083.79
  5. Step 5: Solve for x
    x = 956,007,083.79/30,690.63
  6. Step 6: Final answer
    x = 31,149.80

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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.