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Finding the Fourth Proportional to 70,203, 105,304.50 and 20,955

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Solution

The fourth proportional to 70,203, 105,304.50 and 20,955 is: 31,432.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,203 : 105,304.50 = 20,955 : x
  2. Step 2: Convert to fraction form
    70,203/105,304.50 = 20,955/x
  3. Step 3: Cross multiply
    70,203x = 105,304.50 × 20,955
  4. Step 4: Simplify right side
    70,203x = 2,206,655,797.50
  5. Step 5: Solve for x
    x = 2,206,655,797.50/70,203
  6. Step 6: Final answer
    x = 31,432.50

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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.