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Finding the Fourth Proportional to 70,919.51, 106,379.61 and 21,000.55

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Solution

The fourth proportional to 70,919.51, 106,379.61 and 21,000.55 is: 31,500.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,919.51 : 106,379.61 = 21,000.55 : x
  2. Step 2: Convert to fraction form
    70,919.51/106,379.61 = 21,000.55/x
  3. Step 3: Cross multiply
    70,919.51x = 106,379.61 × 21,000.55
  4. Step 4: Simplify right side
    70,919.51x = 2,234,030,318.79
  5. Step 5: Solve for x
    x = 2,234,030,318.79/70,919.51
  6. Step 6: Final answer
    x = 31,500.93

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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.