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Finding the Fourth Proportional to 993.34, 1,371.46 and 620.84

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Solution

The fourth proportional to 993.34, 1,371.46 and 620.84 is: 857.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.34 : 1,371.46 = 620.84 : x
  2. Step 2: Convert to fraction form
    993.34/1,371.46 = 620.84/x
  3. Step 3: Cross multiply
    993.34x = 1,371.46 × 620.84
  4. Step 4: Simplify right side
    993.34x = 851,457.23
  5. Step 5: Solve for x
    x = 851,457.23/993.34
  6. Step 6: Final answer
    x = 857.17

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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.