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Finding the Fourth Proportional to 70,890.76, 106,356.90 and 20,972.20

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Solution

The fourth proportional to 70,890.76, 106,356.90 and 20,972.20 is: 31,464.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,890.76 : 106,356.90 = 20,972.20 : x
  2. Step 2: Convert to fraction form
    70,890.76/106,356.90 = 20,972.20/x
  3. Step 3: Cross multiply
    70,890.76x = 106,356.90 × 20,972.20
  4. Step 4: Simplify right side
    70,890.76x = 2,230,538,178.18
  5. Step 5: Solve for x
    x = 2,230,538,178.18/70,890.76
  6. Step 6: Final answer
    x = 31,464.44

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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.