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Finding the Fourth Proportional to 993.45, 1,371.60 and 639.51

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Solution

The fourth proportional to 993.45, 1,371.60 and 639.51 is: 882.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.45 : 1,371.60 = 639.51 : x
  2. Step 2: Convert to fraction form
    993.45/1,371.60 = 639.51/x
  3. Step 3: Cross multiply
    993.45x = 1,371.60 × 639.51
  4. Step 4: Simplify right side
    993.45x = 877,144.37
  5. Step 5: Solve for x
    x = 877,144.37/993.45
  6. Step 6: Final answer
    x = 882.92

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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.