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Finding the Fourth Proportional to 72,912.40, 109,368.60 and 36,048.40

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Solution

The fourth proportional to 72,912.40, 109,368.60 and 36,048.40 is: 54,072.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,912.40 : 109,368.60 = 36,048.40 : x
  2. Step 2: Convert to fraction form
    72,912.40/109,368.60 = 36,048.40/x
  3. Step 3: Cross multiply
    72,912.40x = 109,368.60 × 36,048.40
  4. Step 4: Simplify right side
    72,912.40x = 3,942,563,040.24
  5. Step 5: Solve for x
    x = 3,942,563,040.24/72,912.40
  6. Step 6: Final answer
    x = 54,072.60

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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.