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Finding the Fourth Proportional to 625.66, 863.96 and 390.01

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Solution

The fourth proportional to 625.66, 863.96 and 390.01 is: 538.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.66 : 863.96 = 390.01 : x
  2. Step 2: Convert to fraction form
    625.66/863.96 = 390.01/x
  3. Step 3: Cross multiply
    625.66x = 863.96 × 390.01
  4. Step 4: Simplify right side
    625.66x = 336,953.04
  5. Step 5: Solve for x
    x = 336,953.04/625.66
  6. Step 6: Final answer
    x = 538.56

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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.