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Finding the Fourth Proportional to 451.20, 621.88 and 340.48

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Solution

The fourth proportional to 451.20, 621.88 and 340.48 is: 469.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.20 : 621.88 = 340.48 : x
  2. Step 2: Convert to fraction form
    451.20/621.88 = 340.48/x
  3. Step 3: Cross multiply
    451.20x = 621.88 × 340.48
  4. Step 4: Simplify right side
    451.20x = 211,737.70
  5. Step 5: Solve for x
    x = 211,737.70/451.20
  6. Step 6: Final answer
    x = 469.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.