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Finding the Fourth Proportional to 1,005.41, 1,386.79 and 818.91

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Solution

The fourth proportional to 1,005.41, 1,386.79 and 818.91 is: 1,129.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.41 : 1,386.79 = 818.91 : x
  2. Step 2: Convert to fraction form
    1,005.41/1,386.79 = 818.91/x
  3. Step 3: Cross multiply
    1,005.41x = 1,386.79 × 818.91
  4. Step 4: Simplify right side
    1,005.41x = 1,135,654.15
  5. Step 5: Solve for x
    x = 1,135,654.15/1,005.41
  6. Step 6: Final answer
    x = 1,129.54

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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.