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Finding the Fourth Proportional to 30,128.94, 45,193.68 and 7,945.47

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Solution

The fourth proportional to 30,128.94, 45,193.68 and 7,945.47 is: 11,918.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,128.94 : 45,193.68 = 7,945.47 : x
  2. Step 2: Convert to fraction form
    30,128.94/45,193.68 = 7,945.47/x
  3. Step 3: Cross multiply
    30,128.94x = 45,193.68 × 7,945.47
  4. Step 4: Simplify right side
    30,128.94x = 359,085,028.63
  5. Step 5: Solve for x
    x = 359,085,028.63/30,128.94
  6. Step 6: Final answer
    x = 11,918.28

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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.