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Finding the Fourth Proportional to 70,905.54, 106,358.31 and 20,986.14

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Solution

The fourth proportional to 70,905.54, 106,358.31 and 20,986.14 is: 31,479.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,905.54 : 106,358.31 = 20,986.14 : x
  2. Step 2: Convert to fraction form
    70,905.54/106,358.31 = 20,986.14/x
  3. Step 3: Cross multiply
    70,905.54x = 106,358.31 × 20,986.14
  4. Step 4: Simplify right side
    70,905.54x = 2,232,050,383.82
  5. Step 5: Solve for x
    x = 2,232,050,383.82/70,905.54
  6. Step 6: Final answer
    x = 31,479.21

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1.5x scale

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.