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Finding the Fourth Proportional to 936.61, 1,292.60 and 621.34

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Solution

The fourth proportional to 936.61, 1,292.60 and 621.34 is: 857.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.61 : 1,292.60 = 621.34 : x
  2. Step 2: Convert to fraction form
    936.61/1,292.60 = 621.34/x
  3. Step 3: Cross multiply
    936.61x = 1,292.60 × 621.34
  4. Step 4: Simplify right side
    936.61x = 803,144.08
  5. Step 5: Solve for x
    x = 803,144.08/936.61
  6. Step 6: Final answer
    x = 857.50

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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.