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Finding the Fourth Proportional to 455.76, 626.40 and 442.80

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Solution

The fourth proportional to 455.76, 626.40 and 442.80 is: 608.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.76 : 626.40 = 442.80 : x
  2. Step 2: Convert to fraction form
    455.76/626.40 = 442.80/x
  3. Step 3: Cross multiply
    455.76x = 626.40 × 442.80
  4. Step 4: Simplify right side
    455.76x = 277,369.92
  5. Step 5: Solve for x
    x = 277,369.92/455.76
  6. Step 6: Final answer
    x = 608.59

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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.