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Finding the Fourth Proportional to 551.21, 760.61 and 330.13

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Solution

The fourth proportional to 551.21, 760.61 and 330.13 is: 455.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.21 : 760.61 = 330.13 : x
  2. Step 2: Convert to fraction form
    551.21/760.61 = 330.13/x
  3. Step 3: Cross multiply
    551.21x = 760.61 × 330.13
  4. Step 4: Simplify right side
    551.21x = 251,100.18
  5. Step 5: Solve for x
    x = 251,100.18/551.21
  6. Step 6: Final answer
    x = 455.54

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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.