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Finding the Fourth Proportional to 1,007.56, 1,390.80 and 713

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Solution

The fourth proportional to 1,007.56, 1,390.80 and 713 is: 984.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.56 : 1,390.80 = 713 : x
  2. Step 2: Convert to fraction form
    1,007.56/1,390.80 = 713/x
  3. Step 3: Cross multiply
    1,007.56x = 1,390.80 × 713
  4. Step 4: Simplify right side
    1,007.56x = 991,640.40
  5. Step 5: Solve for x
    x = 991,640.40/1,007.56
  6. Step 6: Final answer
    x = 984.20

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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.