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Finding the Fourth Proportional to 6,630, 9,920.28 and 3,999.12

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Solution

The fourth proportional to 6,630, 9,920.28 and 3,999.12 is: 5,983.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,630 : 9,920.28 = 3,999.12 : x
  2. Step 2: Convert to fraction form
    6,630/9,920.28 = 3,999.12/x
  3. Step 3: Cross multiply
    6,630x = 9,920.28 × 3,999.12
  4. Step 4: Simplify right side
    6,630x = 39,672,390.15
  5. Step 5: Solve for x
    x = 39,672,390.15/6,630
  6. Step 6: Final answer
    x = 5,983.77

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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.