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Finding the Fourth Proportional to 30,321.66, 45,488.79 and 12,791.64

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Solution

The fourth proportional to 30,321.66, 45,488.79 and 12,791.64 is: 19,190.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,321.66 : 45,488.79 = 12,791.64 : x
  2. Step 2: Convert to fraction form
    30,321.66/45,488.79 = 12,791.64/x
  3. Step 3: Cross multiply
    30,321.66x = 45,488.79 × 12,791.64
  4. Step 4: Simplify right side
    30,321.66x = 581,876,225.72
  5. Step 5: Solve for x
    x = 581,876,225.72/30,321.66
  6. Step 6: Final answer
    x = 19,190.12

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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.