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Finding the Fourth Proportional to 79.63, 109.91 and 53.77

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Solution

The fourth proportional to 79.63, 109.91 and 53.77 is: 74.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.63 : 109.91 = 53.77 : x
  2. Step 2: Convert to fraction form
    79.63/109.91 = 53.77/x
  3. Step 3: Cross multiply
    79.63x = 109.91 × 53.77
  4. Step 4: Simplify right side
    79.63x = 5,909.72
  5. Step 5: Solve for x
    x = 5,909.72/79.63
  6. Step 6: Final answer
    x = 74.22

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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.