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Finding the Fourth Proportional to 1,387.39, 1,911.96 and 993.73

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Solution

The fourth proportional to 1,387.39, 1,911.96 and 993.73 is: 1,369.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.39 : 1,911.96 = 993.73 : x
  2. Step 2: Convert to fraction form
    1,387.39/1,911.96 = 993.73/x
  3. Step 3: Cross multiply
    1,387.39x = 1,911.96 × 993.73
  4. Step 4: Simplify right side
    1,387.39x = 1,899,972.01
  5. Step 5: Solve for x
    x = 1,899,972.01/1,387.39
  6. Step 6: Final answer
    x = 1,369.46

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Double scale
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1.5x scale

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.