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Finding the Fourth Proportional to 667.86, 995.90 and 621.70

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Solution

The fourth proportional to 667.86, 995.90 and 621.70 is: 927.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.86 : 995.90 = 621.70 : x
  2. Step 2: Convert to fraction form
    667.86/995.90 = 621.70/x
  3. Step 3: Cross multiply
    667.86x = 995.90 × 621.70
  4. Step 4: Simplify right side
    667.86x = 619,151.03
  5. Step 5: Solve for x
    x = 619,151.03/667.86
  6. Step 6: Final answer
    x = 927.07

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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.