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Finding the Fourth Proportional to 486.77, 730.15 and 390.38

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Solution

The fourth proportional to 486.77, 730.15 and 390.38 is: 585.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.77 : 730.15 = 390.38 : x
  2. Step 2: Convert to fraction form
    486.77/730.15 = 390.38/x
  3. Step 3: Cross multiply
    486.77x = 730.15 × 390.38
  4. Step 4: Simplify right side
    486.77x = 285,031.33
  5. Step 5: Solve for x
    x = 285,031.33/486.77
  6. Step 6: Final answer
    x = 585.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.