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Finding the Fourth Proportional to 79.36, 109.54 and 51.77

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Solution

The fourth proportional to 79.36, 109.54 and 51.77 is: 71.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.36 : 109.54 = 51.77 : x
  2. Step 2: Convert to fraction form
    79.36/109.54 = 51.77/x
  3. Step 3: Cross multiply
    79.36x = 109.54 × 51.77
  4. Step 4: Simplify right side
    79.36x = 5,670.93
  5. Step 5: Solve for x
    x = 5,670.93/79.36
  6. Step 6: Final answer
    x = 71.46

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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.