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Finding the Fourth Proportional to 1,315.88, 1,816 and 818.54

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Solution

The fourth proportional to 1,315.88, 1,816 and 818.54 is: 1,129.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.88 : 1,816 = 818.54 : x
  2. Step 2: Convert to fraction form
    1,315.88/1,816 = 818.54/x
  3. Step 3: Cross multiply
    1,315.88x = 1,816 × 818.54
  4. Step 4: Simplify right side
    1,315.88x = 1,486,459.56
  5. Step 5: Solve for x
    x = 1,486,459.56/1,315.88
  6. Step 6: Final answer
    x = 1,129.64

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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.