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Finding the Fourth Proportional to 994.76, 1,373.39 and 640.86

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Solution

The fourth proportional to 994.76, 1,373.39 and 640.86 is: 884.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.76 : 1,373.39 = 640.86 : x
  2. Step 2: Convert to fraction form
    994.76/1,373.39 = 640.86/x
  3. Step 3: Cross multiply
    994.76x = 1,373.39 × 640.86
  4. Step 4: Simplify right side
    994.76x = 880,144.76
  5. Step 5: Solve for x
    x = 880,144.76/994.76
  6. Step 6: Final answer
    x = 884.78

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1.5x scale

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.