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Finding the Fourth Proportional to 417.60, 625.68 and 394.80

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Solution

The fourth proportional to 417.60, 625.68 and 394.80 is: 591.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.60 : 625.68 = 394.80 : x
  2. Step 2: Convert to fraction form
    417.60/625.68 = 394.80/x
  3. Step 3: Cross multiply
    417.60x = 625.68 × 394.80
  4. Step 4: Simplify right side
    417.60x = 247,018.46
  5. Step 5: Solve for x
    x = 247,018.46/417.60
  6. Step 6: Final answer
    x = 591.52

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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.