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Finding the Fourth Proportional to 676.55, 933.72 and 428.12

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Solution

The fourth proportional to 676.55, 933.72 and 428.12 is: 590.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.55 : 933.72 = 428.12 : x
  2. Step 2: Convert to fraction form
    676.55/933.72 = 428.12/x
  3. Step 3: Cross multiply
    676.55x = 933.72 × 428.12
  4. Step 4: Simplify right side
    676.55x = 399,747.34
  5. Step 5: Solve for x
    x = 399,747.34/676.55
  6. Step 6: Final answer
    x = 590.86

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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.