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Finding the Fourth Proportional to 1,005.46, 1,387.81 and 612.48

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Solution

The fourth proportional to 1,005.46, 1,387.81 and 612.48 is: 845.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.46 : 1,387.81 = 612.48 : x
  2. Step 2: Convert to fraction form
    1,005.46/1,387.81 = 612.48/x
  3. Step 3: Cross multiply
    1,005.46x = 1,387.81 × 612.48
  4. Step 4: Simplify right side
    1,005.46x = 850,005.87
  5. Step 5: Solve for x
    x = 850,005.87/1,005.46
  6. Step 6: Final answer
    x = 845.39

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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.