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Finding the Fourth Proportional to 78.23, 107.89 and 57.53

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Solution

The fourth proportional to 78.23, 107.89 and 57.53 is: 79.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.23 : 107.89 = 57.53 : x
  2. Step 2: Convert to fraction form
    78.23/107.89 = 57.53/x
  3. Step 3: Cross multiply
    78.23x = 107.89 × 57.53
  4. Step 4: Simplify right side
    78.23x = 6,206.91
  5. Step 5: Solve for x
    x = 6,206.91/78.23
  6. Step 6: Final answer
    x = 79.34

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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.