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Finding the Fourth Proportional to 85,308.70, 127,963.05 and 40,912.60

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Solution

The fourth proportional to 85,308.70, 127,963.05 and 40,912.60 is: 61,368.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,308.70 : 127,963.05 = 40,912.60 : x
  2. Step 2: Convert to fraction form
    85,308.70/127,963.05 = 40,912.60/x
  3. Step 3: Cross multiply
    85,308.70x = 127,963.05 × 40,912.60
  4. Step 4: Simplify right side
    85,308.70x = 5,235,301,079.43
  5. Step 5: Solve for x
    x = 5,235,301,079.43/85,308.70
  6. Step 6: Final answer
    x = 61,368.90

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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.