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Finding the Fourth Proportional to 5,643.79, 7,788.30 and 3,125.75

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Solution

The fourth proportional to 5,643.79, 7,788.30 and 3,125.75 is: 4,313.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,643.79 : 7,788.30 = 3,125.75 : x
  2. Step 2: Convert to fraction form
    5,643.79/7,788.30 = 3,125.75/x
  3. Step 3: Cross multiply
    5,643.79x = 7,788.30 × 3,125.75
  4. Step 4: Simplify right side
    5,643.79x = 24,344,278.73
  5. Step 5: Solve for x
    x = 24,344,278.73/5,643.79
  6. Step 6: Final answer
    x = 4,313.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.