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Finding the Fourth Proportional to 994.95, 1,373.65 and 641.04

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Solution

The fourth proportional to 994.95, 1,373.65 and 641.04 is: 885.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.95 : 1,373.65 = 641.04 : x
  2. Step 2: Convert to fraction form
    994.95/1,373.65 = 641.04/x
  3. Step 3: Cross multiply
    994.95x = 1,373.65 × 641.04
  4. Step 4: Simplify right side
    994.95x = 880,568.14
  5. Step 5: Solve for x
    x = 880,568.14/994.95
  6. Step 6: Final answer
    x = 885.04

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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.