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Finding the Fourth Proportional to 70,920.02, 106,379.70 and 21,000.40

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Solution

The fourth proportional to 70,920.02, 106,379.70 and 21,000.40 is: 31,500.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,920.02 : 106,379.70 = 21,000.40 : x
  2. Step 2: Convert to fraction form
    70,920.02/106,379.70 = 21,000.40/x
  3. Step 3: Cross multiply
    70,920.02x = 106,379.70 × 21,000.40
  4. Step 4: Simplify right side
    70,920.02x = 2,234,016,251.88
  5. Step 5: Solve for x
    x = 2,234,016,251.88/70,920.02
  6. Step 6: Final answer
    x = 31,500.50

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Double scale
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Similar ratio
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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.