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Finding the Fourth Proportional to 78.90, 108.88 and 43.93

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Solution

The fourth proportional to 78.90, 108.88 and 43.93 is: 60.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.90 : 108.88 = 43.93 : x
  2. Step 2: Convert to fraction form
    78.90/108.88 = 43.93/x
  3. Step 3: Cross multiply
    78.90x = 108.88 × 43.93
  4. Step 4: Simplify right side
    78.90x = 4,783.26
  5. Step 5: Solve for x
    x = 4,783.26/78.90
  6. Step 6: Final answer
    x = 60.62

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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.