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Finding the Fourth Proportional to 43,291.06, 64,939.06 and 12,128.74

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Solution

The fourth proportional to 43,291.06, 64,939.06 and 12,128.74 is: 18,193.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,291.06 : 64,939.06 = 12,128.74 : x
  2. Step 2: Convert to fraction form
    43,291.06/64,939.06 = 12,128.74/x
  3. Step 3: Cross multiply
    43,291.06x = 64,939.06 × 12,128.74
  4. Step 4: Simplify right side
    43,291.06x = 787,628,974.58
  5. Step 5: Solve for x
    x = 787,628,974.58/43,291.06
  6. Step 6: Final answer
    x = 18,193.80

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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.