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Finding the Fourth Proportional to 157.21, 215.09 and 156.61

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Solution

The fourth proportional to 157.21, 215.09 and 156.61 is: 214.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.21 : 215.09 = 156.61 : x
  2. Step 2: Convert to fraction form
    157.21/215.09 = 156.61/x
  3. Step 3: Cross multiply
    157.21x = 215.09 × 156.61
  4. Step 4: Simplify right side
    157.21x = 33,685.24
  5. Step 5: Solve for x
    x = 33,685.24/157.21
  6. Step 6: Final answer
    x = 214.27

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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.