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Finding the Fourth Proportional to 936.88, 1,292.18 and 621.58

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Solution

The fourth proportional to 936.88, 1,292.18 and 621.58 is: 857.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.88 : 1,292.18 = 621.58 : x
  2. Step 2: Convert to fraction form
    936.88/1,292.18 = 621.58/x
  3. Step 3: Cross multiply
    936.88x = 1,292.18 × 621.58
  4. Step 4: Simplify right side
    936.88x = 803,193.24
  5. Step 5: Solve for x
    x = 803,193.24/936.88
  6. Step 6: Final answer
    x = 857.31

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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.