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Finding the Fourth Proportional to 555.13, 765.75 and 330.92

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Solution

The fourth proportional to 555.13, 765.75 and 330.92 is: 456.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.13 : 765.75 = 330.92 : x
  2. Step 2: Convert to fraction form
    555.13/765.75 = 330.92/x
  3. Step 3: Cross multiply
    555.13x = 765.75 × 330.92
  4. Step 4: Simplify right side
    555.13x = 253,400.34
  5. Step 5: Solve for x
    x = 253,400.34/555.13
  6. Step 6: Final answer
    x = 456.47

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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.