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Finding the Fourth Proportional to 780.93, 1,171.40 and 318.96

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Solution

The fourth proportional to 780.93, 1,171.40 and 318.96 is: 478.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.93 : 1,171.40 = 318.96 : x
  2. Step 2: Convert to fraction form
    780.93/1,171.40 = 318.96/x
  3. Step 3: Cross multiply
    780.93x = 1,171.40 × 318.96
  4. Step 4: Simplify right side
    780.93x = 373,628.15
  5. Step 5: Solve for x
    x = 373,628.15/780.93
  6. Step 6: Final answer
    x = 478.44

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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.