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Finding the Fourth Proportional to 779.16, 1,168.54 and 259.21

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Solution

The fourth proportional to 779.16, 1,168.54 and 259.21 is: 388.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.16 : 1,168.54 = 259.21 : x
  2. Step 2: Convert to fraction form
    779.16/1,168.54 = 259.21/x
  3. Step 3: Cross multiply
    779.16x = 1,168.54 × 259.21
  4. Step 4: Simplify right side
    779.16x = 302,897.25
  5. Step 5: Solve for x
    x = 302,897.25/779.16
  6. Step 6: Final answer
    x = 388.75

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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.