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Finding the Fourth Proportional to 993.60, 1,371.81 and 621.09

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Solution

The fourth proportional to 993.60, 1,371.81 and 621.09 is: 857.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.60 : 1,371.81 = 621.09 : x
  2. Step 2: Convert to fraction form
    993.60/1,371.81 = 621.09/x
  3. Step 3: Cross multiply
    993.60x = 1,371.81 × 621.09
  4. Step 4: Simplify right side
    993.60x = 852,017.47
  5. Step 5: Solve for x
    x = 852,017.47/993.60
  6. Step 6: Final answer
    x = 857.51

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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.