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Finding the Fourth Proportional to 1,315.42, 1,815 and 725.88

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Solution

The fourth proportional to 1,315.42, 1,815 and 725.88 is: 1,001.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.42 : 1,815 = 725.88 : x
  2. Step 2: Convert to fraction form
    1,315.42/1,815 = 725.88/x
  3. Step 3: Cross multiply
    1,315.42x = 1,815 × 725.88
  4. Step 4: Simplify right side
    1,315.42x = 1,317,472.20
  5. Step 5: Solve for x
    x = 1,317,472.20/1,315.42
  6. Step 6: Final answer
    x = 1,001.56

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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.