Home / 1,072.20-1,479.75-630.16

Finding the Fourth Proportional to 1,072.20, 1,479.75 and 630.16

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Solution

The fourth proportional to 1,072.20, 1,479.75 and 630.16 is: 869.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.20 : 1,479.75 = 630.16 : x
  2. Step 2: Convert to fraction form
    1,072.20/1,479.75 = 630.16/x
  3. Step 3: Cross multiply
    1,072.20x = 1,479.75 × 630.16
  4. Step 4: Simplify right side
    1,072.20x = 932,479.26
  5. Step 5: Solve for x
    x = 932,479.26/1,072.20
  6. Step 6: Final answer
    x = 869.69

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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.