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Finding the Fourth Proportional to 70,919.49, 106,379.57 and 21,000.53

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Solution

The fourth proportional to 70,919.49, 106,379.57 and 21,000.53 is: 31,500.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,919.49 : 106,379.57 = 21,000.53 : x
  2. Step 2: Convert to fraction form
    70,919.49/106,379.57 = 21,000.53/x
  3. Step 3: Cross multiply
    70,919.49x = 106,379.57 × 21,000.53
  4. Step 4: Simplify right side
    70,919.49x = 2,234,027,351.17
  5. Step 5: Solve for x
    x = 2,234,027,351.17/70,919.49
  6. Step 6: Final answer
    x = 31,500.89

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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.