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Finding the Fourth Proportional to 72,990.60, 109,410.30 and 39,640.20

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Solution

The fourth proportional to 72,990.60, 109,410.30 and 39,640.20 is: 59,419.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,990.60 : 109,410.30 = 39,640.20 : x
  2. Step 2: Convert to fraction form
    72,990.60/109,410.30 = 39,640.20/x
  3. Step 3: Cross multiply
    72,990.60x = 109,410.30 × 39,640.20
  4. Step 4: Simplify right side
    72,990.60x = 4,337,046,174.06
  5. Step 5: Solve for x
    x = 4,337,046,174.06/72,990.60
  6. Step 6: Final answer
    x = 59,419.24

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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.