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Finding the Fourth Proportional to 551.51, 761.08 and 330.65

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Solution

The fourth proportional to 551.51, 761.08 and 330.65 is: 456.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.51 : 761.08 = 330.65 : x
  2. Step 2: Convert to fraction form
    551.51/761.08 = 330.65/x
  3. Step 3: Cross multiply
    551.51x = 761.08 × 330.65
  4. Step 4: Simplify right side
    551.51x = 251,647.30
  5. Step 5: Solve for x
    x = 251,647.30/551.51
  6. Step 6: Final answer
    x = 456.29

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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.