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Finding the Fourth Proportional to 1,330.93, 1,993.34 and 638.08

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Solution

The fourth proportional to 1,330.93, 1,993.34 and 638.08 is: 955.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.93 : 1,993.34 = 638.08 : x
  2. Step 2: Convert to fraction form
    1,330.93/1,993.34 = 638.08/x
  3. Step 3: Cross multiply
    1,330.93x = 1,993.34 × 638.08
  4. Step 4: Simplify right side
    1,330.93x = 1,271,910.39
  5. Step 5: Solve for x
    x = 1,271,910.39/1,330.93
  6. Step 6: Final answer
    x = 955.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.