Home / 1,072.12-1,479.40-629.86

Finding the Fourth Proportional to 1,072.12, 1,479.40 and 629.86

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Solution

The fourth proportional to 1,072.12, 1,479.40 and 629.86 is: 869.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.12 : 1,479.40 = 629.86 : x
  2. Step 2: Convert to fraction form
    1,072.12/1,479.40 = 629.86/x
  3. Step 3: Cross multiply
    1,072.12x = 1,479.40 × 629.86
  4. Step 4: Simplify right side
    1,072.12x = 931,814.88
  5. Step 5: Solve for x
    x = 931,814.88/1,072.12
  6. Step 6: Final answer
    x = 869.13

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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.