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Finding the Fourth Proportional to 1,005.72, 1,387.89 and 674.40

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Solution

The fourth proportional to 1,005.72, 1,387.89 and 674.40 is: 930.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.72 : 1,387.89 = 674.40 : x
  2. Step 2: Convert to fraction form
    1,005.72/1,387.89 = 674.40/x
  3. Step 3: Cross multiply
    1,005.72x = 1,387.89 × 674.40
  4. Step 4: Simplify right side
    1,005.72x = 935,993.02
  5. Step 5: Solve for x
    x = 935,993.02/1,005.72
  6. Step 6: Final answer
    x = 930.67

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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.