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Finding the Fourth Proportional to 455.76, 626.40 and 427.68

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Solution

The fourth proportional to 455.76, 626.40 and 427.68 is: 587.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.76 : 626.40 = 427.68 : x
  2. Step 2: Convert to fraction form
    455.76/626.40 = 427.68/x
  3. Step 3: Cross multiply
    455.76x = 626.40 × 427.68
  4. Step 4: Simplify right side
    455.76x = 267,898.75
  5. Step 5: Solve for x
    x = 267,898.75/455.76
  6. Step 6: Final answer
    x = 587.81

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.