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Finding the Fourth Proportional to 70,258.38, 105,393.09 and 20,339.25

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Solution

The fourth proportional to 70,258.38, 105,393.09 and 20,339.25 is: 30,510.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,258.38 : 105,393.09 = 20,339.25 : x
  2. Step 2: Convert to fraction form
    70,258.38/105,393.09 = 20,339.25/x
  3. Step 3: Cross multiply
    70,258.38x = 105,393.09 × 20,339.25
  4. Step 4: Simplify right side
    70,258.38x = 2,143,616,405.78
  5. Step 5: Solve for x
    x = 2,143,616,405.78/70,258.38
  6. Step 6: Final answer
    x = 30,510.47

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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.