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Finding the Fourth Proportional to 1,395.20, 2,091.68 and 573.88

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Solution

The fourth proportional to 1,395.20, 2,091.68 and 573.88 is: 860.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.20 : 2,091.68 = 573.88 : x
  2. Step 2: Convert to fraction form
    1,395.20/2,091.68 = 573.88/x
  3. Step 3: Cross multiply
    1,395.20x = 2,091.68 × 573.88
  4. Step 4: Simplify right side
    1,395.20x = 1,200,373.32
  5. Step 5: Solve for x
    x = 1,200,373.32/1,395.20
  6. Step 6: Final answer
    x = 860.36

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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.