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Finding the Fourth Proportional to 1,393.80, 2,086.60 and 1,030.21

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Solution

The fourth proportional to 1,393.80, 2,086.60 and 1,030.21 is: 1,542.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.80 : 2,086.60 = 1,030.21 : x
  2. Step 2: Convert to fraction form
    1,393.80/2,086.60 = 1,030.21/x
  3. Step 3: Cross multiply
    1,393.80x = 2,086.60 × 1,030.21
  4. Step 4: Simplify right side
    1,393.80x = 2,149,636.19
  5. Step 5: Solve for x
    x = 2,149,636.19/1,393.80
  6. Step 6: Final answer
    x = 1,542.28

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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.