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Finding the Fourth Proportional to 72,964.36, 100,690.80 and 39,430.36

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Solution

The fourth proportional to 72,964.36, 100,690.80 and 39,430.36 is: 54,413.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,964.36 : 100,690.80 = 39,430.36 : x
  2. Step 2: Convert to fraction form
    72,964.36/100,690.80 = 39,430.36/x
  3. Step 3: Cross multiply
    72,964.36x = 100,690.80 × 39,430.36
  4. Step 4: Simplify right side
    72,964.36x = 3,970,274,492.69
  5. Step 5: Solve for x
    x = 3,970,274,492.69/72,964.36
  6. Step 6: Final answer
    x = 54,413.89

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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.