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Finding the Fourth Proportional to 94.77, 130.68 and 72.90

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Solution

The fourth proportional to 94.77, 130.68 and 72.90 is: 100.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.77 : 130.68 = 72.90 : x
  2. Step 2: Convert to fraction form
    94.77/130.68 = 72.90/x
  3. Step 3: Cross multiply
    94.77x = 130.68 × 72.90
  4. Step 4: Simplify right side
    94.77x = 9,526.57
  5. Step 5: Solve for x
    x = 9,526.57/94.77
  6. Step 6: Final answer
    x = 100.52

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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.