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Finding the Fourth Proportional to 936.50, 1,292.43 and 621.22

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Solution

The fourth proportional to 936.50, 1,292.43 and 621.22 is: 857.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.50 : 1,292.43 = 621.22 : x
  2. Step 2: Convert to fraction form
    936.50/1,292.43 = 621.22/x
  3. Step 3: Cross multiply
    936.50x = 1,292.43 × 621.22
  4. Step 4: Simplify right side
    936.50x = 802,883.36
  5. Step 5: Solve for x
    x = 802,883.36/936.50
  6. Step 6: Final answer
    x = 857.32

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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.