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Finding the Fourth Proportional to 297,279.40, 445,987.21 and 128,828

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Solution

The fourth proportional to 297,279.40, 445,987.21 and 128,828 is: 193,271.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    297,279.40 : 445,987.21 = 128,828 : x
  2. Step 2: Convert to fraction form
    297,279.40/445,987.21 = 128,828/x
  3. Step 3: Cross multiply
    297,279.40x = 445,987.21 × 128,828
  4. Step 4: Simplify right side
    297,279.40x = 57,455,640,289.88
  5. Step 5: Solve for x
    x = 57,455,640,289.88/297,279.40
  6. Step 6: Final answer
    x = 193,271.52

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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.