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Finding the Fourth Proportional to 1,005.47, 1,507.62 and 388.49

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Solution

The fourth proportional to 1,005.47, 1,507.62 and 388.49 is: 582.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.47 : 1,507.62 = 388.49 : x
  2. Step 2: Convert to fraction form
    1,005.47/1,507.62 = 388.49/x
  3. Step 3: Cross multiply
    1,005.47x = 1,507.62 × 388.49
  4. Step 4: Simplify right side
    1,005.47x = 585,695.29
  5. Step 5: Solve for x
    x = 585,695.29/1,005.47
  6. Step 6: Final answer
    x = 582.51

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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.