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Finding the Fourth Proportional to 170,644.88, 255,768 and 128,389.20

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Solution

The fourth proportional to 170,644.88, 255,768 and 128,389.20 is: 192,433.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,644.88 : 255,768 = 128,389.20 : x
  2. Step 2: Convert to fraction form
    170,644.88/255,768 = 128,389.20/x
  3. Step 3: Cross multiply
    170,644.88x = 255,768 × 128,389.20
  4. Step 4: Simplify right side
    170,644.88x = 32,837,848,905.60
  5. Step 5: Solve for x
    x = 32,837,848,905.60/170,644.88
  6. Step 6: Final answer
    x = 192,433.84

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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.