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Finding the Fourth Proportional to 70,678.87, 106,001.90 and 20,745.56

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Solution

The fourth proportional to 70,678.87, 106,001.90 and 20,745.56 is: 31,113.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,678.87 : 106,001.90 = 20,745.56 : x
  2. Step 2: Convert to fraction form
    70,678.87/106,001.90 = 20,745.56/x
  3. Step 3: Cross multiply
    70,678.87x = 106,001.90 × 20,745.56
  4. Step 4: Simplify right side
    70,678.87x = 2,199,068,776.56
  5. Step 5: Solve for x
    x = 2,199,068,776.56/70,678.87
  6. Step 6: Final answer
    x = 31,113.52

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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.