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Finding the Fourth Proportional to 128,534.40, 192,801.60 and 99,009.90

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Solution

The fourth proportional to 128,534.40, 192,801.60 and 99,009.90 is: 148,514.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,534.40 : 192,801.60 = 99,009.90 : x
  2. Step 2: Convert to fraction form
    128,534.40/192,801.60 = 99,009.90/x
  3. Step 3: Cross multiply
    128,534.40x = 192,801.60 × 99,009.90
  4. Step 4: Simplify right side
    128,534.40x = 19,089,267,135.84
  5. Step 5: Solve for x
    x = 19,089,267,135.84/128,534.40
  6. Step 6: Final answer
    x = 148,514.85

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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.