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Finding the Fourth Proportional to 157.07, 216.78 and 94.05

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Solution

The fourth proportional to 157.07, 216.78 and 94.05 is: 129.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.07 : 216.78 = 94.05 : x
  2. Step 2: Convert to fraction form
    157.07/216.78 = 94.05/x
  3. Step 3: Cross multiply
    157.07x = 216.78 × 94.05
  4. Step 4: Simplify right side
    157.07x = 20,388.16
  5. Step 5: Solve for x
    x = 20,388.16/157.07
  6. Step 6: Final answer
    x = 129.80

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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.