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Finding the Fourth Proportional to 936.51, 1,291.52 and 641.87

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Solution

The fourth proportional to 936.51, 1,291.52 and 641.87 is: 885.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.51 : 1,291.52 = 641.87 : x
  2. Step 2: Convert to fraction form
    936.51/1,291.52 = 641.87/x
  3. Step 3: Cross multiply
    936.51x = 1,291.52 × 641.87
  4. Step 4: Simplify right side
    936.51x = 828,987.93
  5. Step 5: Solve for x
    x = 828,987.93/936.51
  6. Step 6: Final answer
    x = 885.19

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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.