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Finding the Fourth Proportional to 555.13, 768.23 and 445.78

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Solution

The fourth proportional to 555.13, 768.23 and 445.78 is: 616.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.13 : 768.23 = 445.78 : x
  2. Step 2: Convert to fraction form
    555.13/768.23 = 445.78/x
  3. Step 3: Cross multiply
    555.13x = 768.23 × 445.78
  4. Step 4: Simplify right side
    555.13x = 342,461.57
  5. Step 5: Solve for x
    x = 342,461.57/555.13
  6. Step 6: Final answer
    x = 616.90

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1.5x scale

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.