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Finding the Fourth Proportional to 157.35, 216.13 and 139.35

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Solution

The fourth proportional to 157.35, 216.13 and 139.35 is: 191.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.35 : 216.13 = 139.35 : x
  2. Step 2: Convert to fraction form
    157.35/216.13 = 139.35/x
  3. Step 3: Cross multiply
    157.35x = 216.13 × 139.35
  4. Step 4: Simplify right side
    157.35x = 30,117.72
  5. Step 5: Solve for x
    x = 30,117.72/157.35
  6. Step 6: Final answer
    x = 191.41

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.