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Finding the Fourth Proportional to 551.40, 760.98 and 330.30

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Solution

The fourth proportional to 551.40, 760.98 and 330.30 is: 455.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.40 : 760.98 = 330.30 : x
  2. Step 2: Convert to fraction form
    551.40/760.98 = 330.30/x
  3. Step 3: Cross multiply
    551.40x = 760.98 × 330.30
  4. Step 4: Simplify right side
    551.40x = 251,351.69
  5. Step 5: Solve for x
    x = 251,351.69/551.40
  6. Step 6: Final answer
    x = 455.84

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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.