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Finding the Fourth Proportional to 676.89, 933.80 and 455.76

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Solution

The fourth proportional to 676.89, 933.80 and 455.76 is: 628.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.89 : 933.80 = 455.76 : x
  2. Step 2: Convert to fraction form
    676.89/933.80 = 455.76/x
  3. Step 3: Cross multiply
    676.89x = 933.80 × 455.76
  4. Step 4: Simplify right side
    676.89x = 425,586.41
  5. Step 5: Solve for x
    x = 425,586.41/676.89
  6. Step 6: Final answer
    x = 628.74

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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.