Home / 1,108.21-1,529.31-636.10

Finding the Fourth Proportional to 1,108.21, 1,529.31 and 636.10

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Solution

The fourth proportional to 1,108.21, 1,529.31 and 636.10 is: 877.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.21 : 1,529.31 = 636.10 : x
  2. Step 2: Convert to fraction form
    1,108.21/1,529.31 = 636.10/x
  3. Step 3: Cross multiply
    1,108.21x = 1,529.31 × 636.10
  4. Step 4: Simplify right side
    1,108.21x = 972,789.79
  5. Step 5: Solve for x
    x = 972,789.79/1,108.21
  6. Step 6: Final answer
    x = 877.80

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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.