Home / 1,279.81-1,766.34-720.31

Finding the Fourth Proportional to 1,279.81, 1,766.34 and 720.31

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Solution

The fourth proportional to 1,279.81, 1,766.34 and 720.31 is: 994.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.81 : 1,766.34 = 720.31 : x
  2. Step 2: Convert to fraction form
    1,279.81/1,766.34 = 720.31/x
  3. Step 3: Cross multiply
    1,279.81x = 1,766.34 × 720.31
  4. Step 4: Simplify right side
    1,279.81x = 1,272,312.37
  5. Step 5: Solve for x
    x = 1,272,312.37/1,279.81
  6. Step 6: Final answer
    x = 994.14

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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.