Home / 1,279.47-1,918.80-630.66

Finding the Fourth Proportional to 1,279.47, 1,918.80 and 630.66

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Solution

The fourth proportional to 1,279.47, 1,918.80 and 630.66 is: 945.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.47 : 1,918.80 = 630.66 : x
  2. Step 2: Convert to fraction form
    1,279.47/1,918.80 = 630.66/x
  3. Step 3: Cross multiply
    1,279.47x = 1,918.80 × 630.66
  4. Step 4: Simplify right side
    1,279.47x = 1,210,110.41
  5. Step 5: Solve for x
    x = 1,210,110.41/1,279.47
  6. Step 6: Final answer
    x = 945.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.