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Finding the Fourth Proportional to 70,969.85, 106,436.62 and 21,038.28

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Solution

The fourth proportional to 70,969.85, 106,436.62 and 21,038.28 is: 31,552.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,969.85 : 106,436.62 = 21,038.28 : x
  2. Step 2: Convert to fraction form
    70,969.85/106,436.62 = 21,038.28/x
  3. Step 3: Cross multiply
    70,969.85x = 106,436.62 × 21,038.28
  4. Step 4: Simplify right side
    70,969.85x = 2,239,243,413.81
  5. Step 5: Solve for x
    x = 2,239,243,413.81/70,969.85
  6. Step 6: Final answer
    x = 31,552.04

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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.