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Finding the Fourth Proportional to 94.12, 129.75 and 72.00

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Solution

The fourth proportional to 94.12, 129.75 and 72.00 is: 99.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.12 : 129.75 = 72.00 : x
  2. Step 2: Convert to fraction form
    94.12/129.75 = 72.00/x
  3. Step 3: Cross multiply
    94.12x = 129.75 × 72.00
  4. Step 4: Simplify right side
    94.12x = 9,341.77
  5. Step 5: Solve for x
    x = 9,341.77/94.12
  6. Step 6: Final answer
    x = 99.26

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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.