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Finding the Fourth Proportional to 994.66, 1,373.12 and 621.85

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Solution

The fourth proportional to 994.66, 1,373.12 and 621.85 is: 858.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.66 : 1,373.12 = 621.85 : x
  2. Step 2: Convert to fraction form
    994.66/1,373.12 = 621.85/x
  3. Step 3: Cross multiply
    994.66x = 1,373.12 × 621.85
  4. Step 4: Simplify right side
    994.66x = 853,874.67
  5. Step 5: Solve for x
    x = 853,874.67/994.66
  6. Step 6: Final answer
    x = 858.46

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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.