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Finding the Fourth Proportional to 94.88, 130.64 and 76.40

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Solution

The fourth proportional to 94.88, 130.64 and 76.40 is: 105.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.88 : 130.64 = 76.40 : x
  2. Step 2: Convert to fraction form
    94.88/130.64 = 76.40/x
  3. Step 3: Cross multiply
    94.88x = 130.64 × 76.40
  4. Step 4: Simplify right side
    94.88x = 9,980.90
  5. Step 5: Solve for x
    x = 9,980.90/94.88
  6. Step 6: Final answer
    x = 105.19

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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.