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Finding the Fourth Proportional to 70,200, 105,300 and 20,952

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Solution

The fourth proportional to 70,200, 105,300 and 20,952 is: 31,428

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,200 : 105,300 = 20,952 : x
  2. Step 2: Convert to fraction form
    70,200/105,300 = 20,952/x
  3. Step 3: Cross multiply
    70,200x = 105,300 × 20,952
  4. Step 4: Simplify right side
    70,200x = 2,206,245,600
  5. Step 5: Solve for x
    x = 2,206,245,600/70,200
  6. Step 6: Final answer
    x = 31,428

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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.