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Finding the Fourth Proportional to 1,005.27, 1,506.75 and 388.66

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Solution

The fourth proportional to 1,005.27, 1,506.75 and 388.66 is: 582.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.27 : 1,506.75 = 388.66 : x
  2. Step 2: Convert to fraction form
    1,005.27/1,506.75 = 388.66/x
  3. Step 3: Cross multiply
    1,005.27x = 1,506.75 × 388.66
  4. Step 4: Simplify right side
    1,005.27x = 585,605.92
  5. Step 5: Solve for x
    x = 585,605.92/1,005.27
  6. Step 6: Final answer
    x = 582.54

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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.