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Finding the Fourth Proportional to 555.72, 766.89 and 307.05

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Solution

The fourth proportional to 555.72, 766.89 and 307.05 is: 423.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.72 : 766.89 = 307.05 : x
  2. Step 2: Convert to fraction form
    555.72/766.89 = 307.05/x
  3. Step 3: Cross multiply
    555.72x = 766.89 × 307.05
  4. Step 4: Simplify right side
    555.72x = 235,473.57
  5. Step 5: Solve for x
    x = 235,473.57/555.72
  6. Step 6: Final answer
    x = 423.73

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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.