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Finding the Fourth Proportional to 666.86, 994.42 and 620.70

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Solution

The fourth proportional to 666.86, 994.42 and 620.70 is: 925.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.86 : 994.42 = 620.70 : x
  2. Step 2: Convert to fraction form
    666.86/994.42 = 620.70/x
  3. Step 3: Cross multiply
    666.86x = 994.42 × 620.70
  4. Step 4: Simplify right side
    666.86x = 617,236.49
  5. Step 5: Solve for x
    x = 617,236.49/666.86
  6. Step 6: Final answer
    x = 925.59

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1.5x scale

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.