Home / 103,828.60-155,645.70-81,326.80

Finding the Fourth Proportional to 103,828.60, 155,645.70 and 81,326.80

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Solution

The fourth proportional to 103,828.60, 155,645.70 and 81,326.80 is: 121,914.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,828.60 : 155,645.70 = 81,326.80 : x
  2. Step 2: Convert to fraction form
    103,828.60/155,645.70 = 81,326.80/x
  3. Step 3: Cross multiply
    103,828.60x = 155,645.70 × 81,326.80
  4. Step 4: Simplify right side
    103,828.60x = 12,658,166,714.76
  5. Step 5: Solve for x
    x = 12,658,166,714.76/103,828.60
  6. Step 6: Final answer
    x = 121,914.07

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1.5x scale

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.