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Finding the Fourth Proportional to 620.78, 929.88 and 414.74

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Solution

The fourth proportional to 620.78, 929.88 and 414.74 is: 621.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.78 : 929.88 = 414.74 : x
  2. Step 2: Convert to fraction form
    620.78/929.88 = 414.74/x
  3. Step 3: Cross multiply
    620.78x = 929.88 × 414.74
  4. Step 4: Simplify right side
    620.78x = 385,658.43
  5. Step 5: Solve for x
    x = 385,658.43/620.78
  6. Step 6: Final answer
    x = 621.25

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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.