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Finding the Fourth Proportional to 85,409.40, 127,811.70 and 74,436.60

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Solution

The fourth proportional to 85,409.40, 127,811.70 and 74,436.60 is: 111,391.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,409.40 : 127,811.70 = 74,436.60 : x
  2. Step 2: Convert to fraction form
    85,409.40/127,811.70 = 74,436.60/x
  3. Step 3: Cross multiply
    85,409.40x = 127,811.70 × 74,436.60
  4. Step 4: Simplify right side
    85,409.40x = 9,513,868,388.22
  5. Step 5: Solve for x
    x = 9,513,868,388.22/85,409.40
  6. Step 6: Final answer
    x = 111,391.35

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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.