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Finding the Fourth Proportional to 72,964.21, 100,690.68 and 39,430.21

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Solution

The fourth proportional to 72,964.21, 100,690.68 and 39,430.21 is: 54,413.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,964.21 : 100,690.68 = 39,430.21 : x
  2. Step 2: Convert to fraction form
    72,964.21/100,690.68 = 39,430.21/x
  3. Step 3: Cross multiply
    72,964.21x = 100,690.68 × 39,430.21
  4. Step 4: Simplify right side
    72,964.21x = 3,970,254,657.44
  5. Step 5: Solve for x
    x = 3,970,254,657.44/72,964.21
  6. Step 6: Final answer
    x = 54,413.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.