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Finding the Fourth Proportional to 156.97, 216.61 and 87.03

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Solution

The fourth proportional to 156.97, 216.61 and 87.03 is: 120.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.97 : 216.61 = 87.03 : x
  2. Step 2: Convert to fraction form
    156.97/216.61 = 87.03/x
  3. Step 3: Cross multiply
    156.97x = 216.61 × 87.03
  4. Step 4: Simplify right side
    156.97x = 18,851.57
  5. Step 5: Solve for x
    x = 18,851.57/156.97
  6. Step 6: Final answer
    x = 120.10

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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.