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Finding the Fourth Proportional to 569.15, 853.72 and 386.09

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Solution

The fourth proportional to 569.15, 853.72 and 386.09 is: 579.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.15 : 853.72 = 386.09 : x
  2. Step 2: Convert to fraction form
    569.15/853.72 = 386.09/x
  3. Step 3: Cross multiply
    569.15x = 853.72 × 386.09
  4. Step 4: Simplify right side
    569.15x = 329,612.75
  5. Step 5: Solve for x
    x = 329,612.75/569.15
  6. Step 6: Final answer
    x = 579.13

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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.