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Finding the Fourth Proportional to 395,393.40, 593,138.70 and 129,081.60

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Solution

The fourth proportional to 395,393.40, 593,138.70 and 129,081.60 is: 193,638.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,393.40 : 593,138.70 = 129,081.60 : x
  2. Step 2: Convert to fraction form
    395,393.40/593,138.70 = 129,081.60/x
  3. Step 3: Cross multiply
    395,393.40x = 593,138.70 × 129,081.60
  4. Step 4: Simplify right side
    395,393.40x = 76,563,292,417.92
  5. Step 5: Solve for x
    x = 76,563,292,417.92/395,393.40
  6. Step 6: Final answer
    x = 193,638.27

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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.