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Finding the Fourth Proportional to 416.28, 623.60 and 390.76

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Solution

The fourth proportional to 416.28, 623.60 and 390.76 is: 585.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.28 : 623.60 = 390.76 : x
  2. Step 2: Convert to fraction form
    416.28/623.60 = 390.76/x
  3. Step 3: Cross multiply
    416.28x = 623.60 × 390.76
  4. Step 4: Simplify right side
    416.28x = 243,677.94
  5. Step 5: Solve for x
    x = 243,677.94/416.28
  6. Step 6: Final answer
    x = 585.37

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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.