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Finding the Fourth Proportional to 94.72, 130.48 and 72.88

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Solution

The fourth proportional to 94.72, 130.48 and 72.88 is: 100.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.72 : 130.48 = 72.88 : x
  2. Step 2: Convert to fraction form
    94.72/130.48 = 72.88/x
  3. Step 3: Cross multiply
    94.72x = 130.48 × 72.88
  4. Step 4: Simplify right side
    94.72x = 9,509.38
  5. Step 5: Solve for x
    x = 9,509.38/94.72
  6. Step 6: Final answer
    x = 100.39

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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.