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Finding the Fourth Proportional to 780.06, 1,168.61 and 486.65

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Solution

The fourth proportional to 780.06, 1,168.61 and 486.65 is: 729.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.06 : 1,168.61 = 486.65 : x
  2. Step 2: Convert to fraction form
    780.06/1,168.61 = 486.65/x
  3. Step 3: Cross multiply
    780.06x = 1,168.61 × 486.65
  4. Step 4: Simplify right side
    780.06x = 568,695.78
  5. Step 5: Solve for x
    x = 568,695.78/780.06
  6. Step 6: Final answer
    x = 729.04

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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.