Home / 1,115.11-1,538.77-617.72

Finding the Fourth Proportional to 1,115.11, 1,538.77 and 617.72

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Solution

The fourth proportional to 1,115.11, 1,538.77 and 617.72 is: 852.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.11 : 1,538.77 = 617.72 : x
  2. Step 2: Convert to fraction form
    1,115.11/1,538.77 = 617.72/x
  3. Step 3: Cross multiply
    1,115.11x = 1,538.77 × 617.72
  4. Step 4: Simplify right side
    1,115.11x = 950,529.00
  5. Step 5: Solve for x
    x = 950,529.00/1,115.11
  6. Step 6: Final answer
    x = 852.41

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Double scale
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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.