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Finding the Fourth Proportional to 30,212.40, 45,329.40 and 12,687.60

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Solution

The fourth proportional to 30,212.40, 45,329.40 and 12,687.60 is: 19,035.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,212.40 : 45,329.40 = 12,687.60 : x
  2. Step 2: Convert to fraction form
    30,212.40/45,329.40 = 12,687.60/x
  3. Step 3: Cross multiply
    30,212.40x = 45,329.40 × 12,687.60
  4. Step 4: Simplify right side
    30,212.40x = 575,121,295.44
  5. Step 5: Solve for x
    x = 575,121,295.44/30,212.40
  6. Step 6: Final answer
    x = 19,035.94

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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.