Home / 1,319.28-1,820.58-729.82

Finding the Fourth Proportional to 1,319.28, 1,820.58 and 729.82

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Solution

The fourth proportional to 1,319.28, 1,820.58 and 729.82 is: 1,007.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.28 : 1,820.58 = 729.82 : x
  2. Step 2: Convert to fraction form
    1,319.28/1,820.58 = 729.82/x
  3. Step 3: Cross multiply
    1,319.28x = 1,820.58 × 729.82
  4. Step 4: Simplify right side
    1,319.28x = 1,328,691.14
  5. Step 5: Solve for x
    x = 1,328,691.14/1,319.28
  6. Step 6: Final answer
    x = 1,007.13

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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.