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Finding the Fourth Proportional to 136,890.40, 205,335.60 and 84,128.80

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Solution

The fourth proportional to 136,890.40, 205,335.60 and 84,128.80 is: 126,193.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,890.40 : 205,335.60 = 84,128.80 : x
  2. Step 2: Convert to fraction form
    136,890.40/205,335.60 = 84,128.80/x
  3. Step 3: Cross multiply
    136,890.40x = 205,335.60 × 84,128.80
  4. Step 4: Simplify right side
    136,890.40x = 17,274,637,625.28
  5. Step 5: Solve for x
    x = 17,274,637,625.28/136,890.40
  6. Step 6: Final answer
    x = 126,193.20

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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.