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Finding the Fourth Proportional to 85,978.45, 118,455.09 and 66,530.49

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Solution

The fourth proportional to 85,978.45, 118,455.09 and 66,530.49 is: 91,661.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,978.45 : 118,455.09 = 66,530.49 : x
  2. Step 2: Convert to fraction form
    85,978.45/118,455.09 = 66,530.49/x
  3. Step 3: Cross multiply
    85,978.45x = 118,455.09 × 66,530.49
  4. Step 4: Simplify right side
    85,978.45x = 7,880,875,180.69
  5. Step 5: Solve for x
    x = 7,880,875,180.69/85,978.45
  6. Step 6: Final answer
    x = 91,661.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.