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Finding the Fourth Proportional to 936, 1,290.35 and 670.37

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Solution

The fourth proportional to 936, 1,290.35 and 670.37 is: 924.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    936 : 1,290.35 = 670.37 : x
  2. Step 2: Convert to fraction form
    936/1,290.35 = 670.37/x
  3. Step 3: Cross multiply
    936x = 1,290.35 × 670.37
  4. Step 4: Simplify right side
    936x = 865,007.15
  5. Step 5: Solve for x
    x = 865,007.15/936
  6. Step 6: Final answer
    x = 924.15

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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.