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Finding the Fourth Proportional to 936.74, 1,291.54 and 715.34

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Solution

The fourth proportional to 936.74, 1,291.54 and 715.34 is: 986.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.74 : 1,291.54 = 715.34 : x
  2. Step 2: Convert to fraction form
    936.74/1,291.54 = 715.34/x
  3. Step 3: Cross multiply
    936.74x = 1,291.54 × 715.34
  4. Step 4: Simplify right side
    936.74x = 923,890.22
  5. Step 5: Solve for x
    x = 923,890.22/936.74
  6. Step 6: Final answer
    x = 986.28

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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.