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Finding the Fourth Proportional to 157.31, 215.97 and 153.29

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Solution

The fourth proportional to 157.31, 215.97 and 153.29 is: 210.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.31 : 215.97 = 153.29 : x
  2. Step 2: Convert to fraction form
    157.31/215.97 = 153.29/x
  3. Step 3: Cross multiply
    157.31x = 215.97 × 153.29
  4. Step 4: Simplify right side
    157.31x = 33,106.04
  5. Step 5: Solve for x
    x = 33,106.04/157.31
  6. Step 6: Final answer
    x = 210.45

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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.