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Finding the Fourth Proportional to 1,005.73, 1,387.92 and 612.79

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Solution

The fourth proportional to 1,005.73, 1,387.92 and 612.79 is: 845.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.73 : 1,387.92 = 612.79 : x
  2. Step 2: Convert to fraction form
    1,005.73/1,387.92 = 612.79/x
  3. Step 3: Cross multiply
    1,005.73x = 1,387.92 × 612.79
  4. Step 4: Simplify right side
    1,005.73x = 850,503.50
  5. Step 5: Solve for x
    x = 850,503.50/1,005.73
  6. Step 6: Final answer
    x = 845.66

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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.