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Finding the Fourth Proportional to 6,619.80, 9,929.70 and 3,547.80

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Solution

The fourth proportional to 6,619.80, 9,929.70 and 3,547.80 is: 5,321.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,619.80 : 9,929.70 = 3,547.80 : x
  2. Step 2: Convert to fraction form
    6,619.80/9,929.70 = 3,547.80/x
  3. Step 3: Cross multiply
    6,619.80x = 9,929.70 × 3,547.80
  4. Step 4: Simplify right side
    6,619.80x = 35,228,589.66
  5. Step 5: Solve for x
    x = 35,228,589.66/6,619.80
  6. Step 6: Final answer
    x = 5,321.70

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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.