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Finding the Fourth Proportional to 555.30, 766.30 and 319.29

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Solution

The fourth proportional to 555.30, 766.30 and 319.29 is: 440.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.30 : 766.30 = 319.29 : x
  2. Step 2: Convert to fraction form
    555.30/766.30 = 319.29/x
  3. Step 3: Cross multiply
    555.30x = 766.30 × 319.29
  4. Step 4: Simplify right side
    555.30x = 244,671.93
  5. Step 5: Solve for x
    x = 244,671.93/555.30
  6. Step 6: Final answer
    x = 440.61

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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.