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Finding the Fourth Proportional to 555.75, 766.92 and 307.09

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Solution

The fourth proportional to 555.75, 766.92 and 307.09 is: 423.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.75 : 766.92 = 307.09 : x
  2. Step 2: Convert to fraction form
    555.75/766.92 = 307.09/x
  3. Step 3: Cross multiply
    555.75x = 766.92 × 307.09
  4. Step 4: Simplify right side
    555.75x = 235,513.46
  5. Step 5: Solve for x
    x = 235,513.46/555.75
  6. Step 6: Final answer
    x = 423.78

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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.