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Finding the Fourth Proportional to 72,990.40, 109,485.60 and 41,828.80

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Solution

The fourth proportional to 72,990.40, 109,485.60 and 41,828.80 is: 62,743.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,990.40 : 109,485.60 = 41,828.80 : x
  2. Step 2: Convert to fraction form
    72,990.40/109,485.60 = 41,828.80/x
  3. Step 3: Cross multiply
    72,990.40x = 109,485.60 × 41,828.80
  4. Step 4: Simplify right side
    72,990.40x = 4,579,651,265.28
  5. Step 5: Solve for x
    x = 4,579,651,265.28/72,990.40
  6. Step 6: Final answer
    x = 62,743.20

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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.