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Finding the Fourth Proportional to 625.77, 864.43 and 439.20

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Solution

The fourth proportional to 625.77, 864.43 and 439.20 is: 606.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.77 : 864.43 = 439.20 : x
  2. Step 2: Convert to fraction form
    625.77/864.43 = 439.20/x
  3. Step 3: Cross multiply
    625.77x = 864.43 × 439.20
  4. Step 4: Simplify right side
    625.77x = 379,656.56
  5. Step 5: Solve for x
    x = 379,656.56/625.77
  6. Step 6: Final answer
    x = 606.70

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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.