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Finding the Fourth Proportional to 993.21, 1,370.30 and 643.97

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Solution

The fourth proportional to 993.21, 1,370.30 and 643.97 is: 888.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.21 : 1,370.30 = 643.97 : x
  2. Step 2: Convert to fraction form
    993.21/1,370.30 = 643.97/x
  3. Step 3: Cross multiply
    993.21x = 1,370.30 × 643.97
  4. Step 4: Simplify right side
    993.21x = 882,422.02
  5. Step 5: Solve for x
    x = 882,422.02/993.21
  6. Step 6: Final answer
    x = 888.45

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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.