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Finding the Fourth Proportional to 6,620.07, 9,929.90 and 1,689.69

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Solution

The fourth proportional to 6,620.07, 9,929.90 and 1,689.69 is: 2,534.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,620.07 : 9,929.90 = 1,689.69 : x
  2. Step 2: Convert to fraction form
    6,620.07/9,929.90 = 1,689.69/x
  3. Step 3: Cross multiply
    6,620.07x = 9,929.90 × 1,689.69
  4. Step 4: Simplify right side
    6,620.07x = 16,778,444.28
  5. Step 5: Solve for x
    x = 16,778,444.28/6,620.07
  6. Step 6: Final answer
    x = 2,534.48

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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.