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Finding the Fourth Proportional to 780.30, 1,169.43 and 317.54

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Solution

The fourth proportional to 780.30, 1,169.43 and 317.54 is: 475.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.30 : 1,169.43 = 317.54 : x
  2. Step 2: Convert to fraction form
    780.30/1,169.43 = 317.54/x
  3. Step 3: Cross multiply
    780.30x = 1,169.43 × 317.54
  4. Step 4: Simplify right side
    780.30x = 371,335.75
  5. Step 5: Solve for x
    x = 371,335.75/780.30
  6. Step 6: Final answer
    x = 475.89

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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.