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Finding the Fourth Proportional to 1,318.78, 1,818.37 and 899.38

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Solution

The fourth proportional to 1,318.78, 1,818.37 and 899.38 is: 1,240.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.78 : 1,818.37 = 899.38 : x
  2. Step 2: Convert to fraction form
    1,318.78/1,818.37 = 899.38/x
  3. Step 3: Cross multiply
    1,318.78x = 1,818.37 × 899.38
  4. Step 4: Simplify right side
    1,318.78x = 1,635,405.61
  5. Step 5: Solve for x
    x = 1,635,405.61/1,318.78
  6. Step 6: Final answer
    x = 1,240.09

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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.