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Finding the Fourth Proportional to 2,100.40, 3,148.47 and 713.28

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Solution

The fourth proportional to 2,100.40, 3,148.47 and 713.28 is: 1,069.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.40 : 3,148.47 = 713.28 : x
  2. Step 2: Convert to fraction form
    2,100.40/3,148.47 = 713.28/x
  3. Step 3: Cross multiply
    2,100.40x = 3,148.47 × 713.28
  4. Step 4: Simplify right side
    2,100.40x = 2,245,740.68
  5. Step 5: Solve for x
    x = 2,245,740.68/2,100.40
  6. Step 6: Final answer
    x = 1,069.20

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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.