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Finding the Fourth Proportional to 5,188.64, 7,784.40 and 1,679.22

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Solution

The fourth proportional to 5,188.64, 7,784.40 and 1,679.22 is: 2,519.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,188.64 : 7,784.40 = 1,679.22 : x
  2. Step 2: Convert to fraction form
    5,188.64/7,784.40 = 1,679.22/x
  3. Step 3: Cross multiply
    5,188.64x = 7,784.40 × 1,679.22
  4. Step 4: Simplify right side
    5,188.64x = 13,071,720.17
  5. Step 5: Solve for x
    x = 13,071,720.17/5,188.64
  6. Step 6: Final answer
    x = 2,519.30

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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.