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Finding the Fourth Proportional to 1,215.60, 1,678.08 and 795.96

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Solution

The fourth proportional to 1,215.60, 1,678.08 and 795.96 is: 1,098.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.60 : 1,678.08 = 795.96 : x
  2. Step 2: Convert to fraction form
    1,215.60/1,678.08 = 795.96/x
  3. Step 3: Cross multiply
    1,215.60x = 1,678.08 × 795.96
  4. Step 4: Simplify right side
    1,215.60x = 1,335,684.56
  5. Step 5: Solve for x
    x = 1,335,684.56/1,215.60
  6. Step 6: Final answer
    x = 1,098.79

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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.