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Finding the Fourth Proportional to 5,619.80, 8,429.70 and 5,457.80

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Solution

The fourth proportional to 5,619.80, 8,429.70 and 5,457.80 is: 8,186.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,619.80 : 8,429.70 = 5,457.80 : x
  2. Step 2: Convert to fraction form
    5,619.80/8,429.70 = 5,457.80/x
  3. Step 3: Cross multiply
    5,619.80x = 8,429.70 × 5,457.80
  4. Step 4: Simplify right side
    5,619.80x = 46,007,616.66
  5. Step 5: Solve for x
    x = 46,007,616.66/5,619.80
  6. Step 6: Final answer
    x = 8,186.70

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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.