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Finding the Fourth Proportional to 853.72, 1,178.15 and 517.57

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Solution

The fourth proportional to 853.72, 1,178.15 and 517.57 is: 714.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.72 : 1,178.15 = 517.57 : x
  2. Step 2: Convert to fraction form
    853.72/1,178.15 = 517.57/x
  3. Step 3: Cross multiply
    853.72x = 1,178.15 × 517.57
  4. Step 4: Simplify right side
    853.72x = 609,775.10
  5. Step 5: Solve for x
    x = 609,775.10/853.72
  6. Step 6: Final answer
    x = 714.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.