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Finding the Fourth Proportional to 193.68, 290.56 and 78.16

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Solution

The fourth proportional to 193.68, 290.56 and 78.16 is: 117.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.68 : 290.56 = 78.16 : x
  2. Step 2: Convert to fraction form
    193.68/290.56 = 78.16/x
  3. Step 3: Cross multiply
    193.68x = 290.56 × 78.16
  4. Step 4: Simplify right side
    193.68x = 22,710.17
  5. Step 5: Solve for x
    x = 22,710.17/193.68
  6. Step 6: Final answer
    x = 117.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.