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Finding the Fourth Proportional to 936.61, 1,292.71 and 621.89

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Solution

The fourth proportional to 936.61, 1,292.71 and 621.89 is: 858.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.61 : 1,292.71 = 621.89 : x
  2. Step 2: Convert to fraction form
    936.61/1,292.71 = 621.89/x
  3. Step 3: Cross multiply
    936.61x = 1,292.71 × 621.89
  4. Step 4: Simplify right side
    936.61x = 803,923.42
  5. Step 5: Solve for x
    x = 803,923.42/936.61
  6. Step 6: Final answer
    x = 858.33

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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.