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Finding the Fourth Proportional to 1,375.23, 1,898.24 and 815.87

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Solution

The fourth proportional to 1,375.23, 1,898.24 and 815.87 is: 1,126.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.23 : 1,898.24 = 815.87 : x
  2. Step 2: Convert to fraction form
    1,375.23/1,898.24 = 815.87/x
  3. Step 3: Cross multiply
    1,375.23x = 1,898.24 × 815.87
  4. Step 4: Simplify right side
    1,375.23x = 1,548,717.74
  5. Step 5: Solve for x
    x = 1,548,717.74/1,375.23
  6. Step 6: Final answer
    x = 1,126.15

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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.