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Finding the Fourth Proportional to 551.47, 761.11 and 330.47

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Solution

The fourth proportional to 551.47, 761.11 and 330.47 is: 456.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.47 : 761.11 = 330.47 : x
  2. Step 2: Convert to fraction form
    551.47/761.11 = 330.47/x
  3. Step 3: Cross multiply
    551.47x = 761.11 × 330.47
  4. Step 4: Simplify right side
    551.47x = 251,525.10
  5. Step 5: Solve for x
    x = 251,525.10/551.47
  6. Step 6: Final answer
    x = 456.10

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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.