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Finding the Fourth Proportional to 1,319.33, 1,820.58 and 729.88

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Solution

The fourth proportional to 1,319.33, 1,820.58 and 729.88 is: 1,007.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.33 : 1,820.58 = 729.88 : x
  2. Step 2: Convert to fraction form
    1,319.33/1,820.58 = 729.88/x
  3. Step 3: Cross multiply
    1,319.33x = 1,820.58 × 729.88
  4. Step 4: Simplify right side
    1,319.33x = 1,328,804.93
  5. Step 5: Solve for x
    x = 1,328,804.93/1,319.33
  6. Step 6: Final answer
    x = 1,007.18

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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.