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Finding the Fourth Proportional to 85,918.63, 128,705.49 and 43,797.01

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Solution

The fourth proportional to 85,918.63, 128,705.49 and 43,797.01 is: 65,607.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,918.63 : 128,705.49 = 43,797.01 : x
  2. Step 2: Convert to fraction form
    85,918.63/128,705.49 = 43,797.01/x
  3. Step 3: Cross multiply
    85,918.63x = 128,705.49 × 43,797.01
  4. Step 4: Simplify right side
    85,918.63x = 5,636,914,770.07
  5. Step 5: Solve for x
    x = 5,636,914,770.07/85,918.63
  6. Step 6: Final answer
    x = 65,607.60

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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.