Home / 1,279.86-1,766.29-720.38

Finding the Fourth Proportional to 1,279.86, 1,766.29 and 720.38

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Solution

The fourth proportional to 1,279.86, 1,766.29 and 720.38 is: 994.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.86 : 1,766.29 = 720.38 : x
  2. Step 2: Convert to fraction form
    1,279.86/1,766.29 = 720.38/x
  3. Step 3: Cross multiply
    1,279.86x = 1,766.29 × 720.38
  4. Step 4: Simplify right side
    1,279.86x = 1,272,393.77
  5. Step 5: Solve for x
    x = 1,272,393.77/1,279.86
  6. Step 6: Final answer
    x = 994.17

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1.5x scale

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.