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Finding the Fourth Proportional to 1,315.32, 1,815 and 725.82

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Solution

The fourth proportional to 1,315.32, 1,815 and 725.82 is: 1,001.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.32 : 1,815 = 725.82 : x
  2. Step 2: Convert to fraction form
    1,315.32/1,815 = 725.82/x
  3. Step 3: Cross multiply
    1,315.32x = 1,815 × 725.82
  4. Step 4: Simplify right side
    1,315.32x = 1,317,363.30
  5. Step 5: Solve for x
    x = 1,317,363.30/1,315.32
  6. Step 6: Final answer
    x = 1,001.55

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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.