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Finding the Fourth Proportional to 53.90, 80.24 and 53.60

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Solution

The fourth proportional to 53.90, 80.24 and 53.60 is: 79.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.90 : 80.24 = 53.60 : x
  2. Step 2: Convert to fraction form
    53.90/80.24 = 53.60/x
  3. Step 3: Cross multiply
    53.90x = 80.24 × 53.60
  4. Step 4: Simplify right side
    53.90x = 4,300.86
  5. Step 5: Solve for x
    x = 4,300.86/53.90
  6. Step 6: Final answer
    x = 79.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.