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Finding the Fourth Proportional to 555.39, 766.40 and 306.74

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Solution

The fourth proportional to 555.39, 766.40 and 306.74 is: 423.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.39 : 766.40 = 306.74 : x
  2. Step 2: Convert to fraction form
    555.39/766.40 = 306.74/x
  3. Step 3: Cross multiply
    555.39x = 766.40 × 306.74
  4. Step 4: Simplify right side
    555.39x = 235,085.54
  5. Step 5: Solve for x
    x = 235,085.54/555.39
  6. Step 6: Final answer
    x = 423.28

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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.