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Finding the Fourth Proportional to 1,005.12, 1,507.32 and 388.52

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Solution

The fourth proportional to 1,005.12, 1,507.32 and 388.52 is: 582.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.12 : 1,507.32 = 388.52 : x
  2. Step 2: Convert to fraction form
    1,005.12/1,507.32 = 388.52/x
  3. Step 3: Cross multiply
    1,005.12x = 1,507.32 × 388.52
  4. Step 4: Simplify right side
    1,005.12x = 585,616.43
  5. Step 5: Solve for x
    x = 585,616.43/1,005.12
  6. Step 6: Final answer
    x = 582.63

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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.