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Finding the Fourth Proportional to 156.94, 216.57 and 87

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Solution

The fourth proportional to 156.94, 216.57 and 87 is: 120.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.94 : 216.57 = 87 : x
  2. Step 2: Convert to fraction form
    156.94/216.57 = 87/x
  3. Step 3: Cross multiply
    156.94x = 216.57 × 87
  4. Step 4: Simplify right side
    156.94x = 18,841.59
  5. Step 5: Solve for x
    x = 18,841.59/156.94
  6. Step 6: Final answer
    x = 120.06

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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.