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Finding the Fourth Proportional to 1,374.60, 1,896.95 and 815.34

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Solution

The fourth proportional to 1,374.60, 1,896.95 and 815.34 is: 1,125.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,374.60 : 1,896.95 = 815.34 : x
  2. Step 2: Convert to fraction form
    1,374.60/1,896.95 = 815.34/x
  3. Step 3: Cross multiply
    1,374.60x = 1,896.95 × 815.34
  4. Step 4: Simplify right side
    1,374.60x = 1,546,663.78
  5. Step 5: Solve for x
    x = 1,546,663.78/1,374.60
  6. Step 6: Final answer
    x = 1,125.18

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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.