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Finding the Fourth Proportional to 79.97, 120.15 and 56.07

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Solution

The fourth proportional to 79.97, 120.15 and 56.07 is: 84.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.97 : 120.15 = 56.07 : x
  2. Step 2: Convert to fraction form
    79.97/120.15 = 56.07/x
  3. Step 3: Cross multiply
    79.97x = 120.15 × 56.07
  4. Step 4: Simplify right side
    79.97x = 6,736.81
  5. Step 5: Solve for x
    x = 6,736.81/79.97
  6. Step 6: Final answer
    x = 84.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.