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Finding the Fourth Proportional to 157.41, 217.35 and 139.23

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Solution

The fourth proportional to 157.41, 217.35 and 139.23 is: 192.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.41 : 217.35 = 139.23 : x
  2. Step 2: Convert to fraction form
    157.41/217.35 = 139.23/x
  3. Step 3: Cross multiply
    157.41x = 217.35 × 139.23
  4. Step 4: Simplify right side
    157.41x = 30,261.64
  5. Step 5: Solve for x
    x = 30,261.64/157.41
  6. Step 6: Final answer
    x = 192.25

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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.