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Finding the Fourth Proportional to 780.72, 1,171.46 and 318.84

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Solution

The fourth proportional to 780.72, 1,171.46 and 318.84 is: 478.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.72 : 1,171.46 = 318.84 : x
  2. Step 2: Convert to fraction form
    780.72/1,171.46 = 318.84/x
  3. Step 3: Cross multiply
    780.72x = 1,171.46 × 318.84
  4. Step 4: Simplify right side
    780.72x = 373,508.31
  5. Step 5: Solve for x
    x = 373,508.31/780.72
  6. Step 6: Final answer
    x = 478.42

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.