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Finding the Fourth Proportional to 91,325.60, 137,090.80 and 70,640.80

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Solution

The fourth proportional to 91,325.60, 137,090.80 and 70,640.80 is: 106,040.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,325.60 : 137,090.80 = 70,640.80 : x
  2. Step 2: Convert to fraction form
    91,325.60/137,090.80 = 70,640.80/x
  3. Step 3: Cross multiply
    91,325.60x = 137,090.80 × 70,640.80
  4. Step 4: Simplify right side
    91,325.60x = 9,684,203,784.64
  5. Step 5: Solve for x
    x = 9,684,203,784.64/91,325.60
  6. Step 6: Final answer
    x = 106,040.41

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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.