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Finding the Fourth Proportional to 72,677.80, 109,016.70 and 68,300.20

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Solution

The fourth proportional to 72,677.80, 109,016.70 and 68,300.20 is: 102,450.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,677.80 : 109,016.70 = 68,300.20 : x
  2. Step 2: Convert to fraction form
    72,677.80/109,016.70 = 68,300.20/x
  3. Step 3: Cross multiply
    72,677.80x = 109,016.70 × 68,300.20
  4. Step 4: Simplify right side
    72,677.80x = 7,445,862,413.34
  5. Step 5: Solve for x
    x = 7,445,862,413.34/72,677.80
  6. Step 6: Final answer
    x = 102,450.30

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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.