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Finding the Fourth Proportional to 625.94, 864.21 and 390.23

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Solution

The fourth proportional to 625.94, 864.21 and 390.23 is: 538.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.94 : 864.21 = 390.23 : x
  2. Step 2: Convert to fraction form
    625.94/864.21 = 390.23/x
  3. Step 3: Cross multiply
    625.94x = 864.21 × 390.23
  4. Step 4: Simplify right side
    625.94x = 337,240.67
  5. Step 5: Solve for x
    x = 337,240.67/625.94
  6. Step 6: Final answer
    x = 538.77

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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.