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Finding the Fourth Proportional to 70,982.80, 106,474.20 and 21,070.60

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Solution

The fourth proportional to 70,982.80, 106,474.20 and 21,070.60 is: 31,605.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,982.80 : 106,474.20 = 21,070.60 : x
  2. Step 2: Convert to fraction form
    70,982.80/106,474.20 = 21,070.60/x
  3. Step 3: Cross multiply
    70,982.80x = 106,474.20 × 21,070.60
  4. Step 4: Simplify right side
    70,982.80x = 2,243,475,278.52
  5. Step 5: Solve for x
    x = 2,243,475,278.52/70,982.80
  6. Step 6: Final answer
    x = 31,605.90

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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.