Home / 1,115.20-1,538.88-617.80

Finding the Fourth Proportional to 1,115.20, 1,538.88 and 617.80

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Solution

The fourth proportional to 1,115.20, 1,538.88 and 617.80 is: 852.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.20 : 1,538.88 = 617.80 : x
  2. Step 2: Convert to fraction form
    1,115.20/1,538.88 = 617.80/x
  3. Step 3: Cross multiply
    1,115.20x = 1,538.88 × 617.80
  4. Step 4: Simplify right side
    1,115.20x = 950,720.06
  5. Step 5: Solve for x
    x = 950,720.06/1,115.20
  6. Step 6: Final answer
    x = 852.51

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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.