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Finding the Fourth Proportional to 631.20, 937.65 and 620.40

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Solution

The fourth proportional to 631.20, 937.65 and 620.40 is: 921.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.20 : 937.65 = 620.40 : x
  2. Step 2: Convert to fraction form
    631.20/937.65 = 620.40/x
  3. Step 3: Cross multiply
    631.20x = 937.65 × 620.40
  4. Step 4: Simplify right side
    631.20x = 581,718.06
  5. Step 5: Solve for x
    x = 581,718.06/631.20
  6. Step 6: Final answer
    x = 921.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.