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Finding the Fourth Proportional to 1,404.92, 1,938.60 and 815

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Solution

The fourth proportional to 1,404.92, 1,938.60 and 815 is: 1,124.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,404.92 : 1,938.60 = 815 : x
  2. Step 2: Convert to fraction form
    1,404.92/1,938.60 = 815/x
  3. Step 3: Cross multiply
    1,404.92x = 1,938.60 × 815
  4. Step 4: Simplify right side
    1,404.92x = 1,579,959
  5. Step 5: Solve for x
    x = 1,579,959/1,404.92
  6. Step 6: Final answer
    x = 1,124.59

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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.