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Finding the Fourth Proportional to 788.30, 1,181.25 and 718.70

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Solution

The fourth proportional to 788.30, 1,181.25 and 718.70 is: 1,076.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.30 : 1,181.25 = 718.70 : x
  2. Step 2: Convert to fraction form
    788.30/1,181.25 = 718.70/x
  3. Step 3: Cross multiply
    788.30x = 1,181.25 × 718.70
  4. Step 4: Simplify right side
    788.30x = 848,964.38
  5. Step 5: Solve for x
    x = 848,964.38/788.30
  6. Step 6: Final answer
    x = 1,076.96

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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.