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Finding the Fourth Proportional to 79.05, 117.76 and 72.03

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Solution

The fourth proportional to 79.05, 117.76 and 72.03 is: 107.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.05 : 117.76 = 72.03 : x
  2. Step 2: Convert to fraction form
    79.05/117.76 = 72.03/x
  3. Step 3: Cross multiply
    79.05x = 117.76 × 72.03
  4. Step 4: Simplify right side
    79.05x = 8,482.07
  5. Step 5: Solve for x
    x = 8,482.07/79.05
  6. Step 6: Final answer
    x = 107.30

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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.