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Finding the Fourth Proportional to 156.40, 216.04 and 115.04

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Solution

The fourth proportional to 156.40, 216.04 and 115.04 is: 158.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.40 : 216.04 = 115.04 : x
  2. Step 2: Convert to fraction form
    156.40/216.04 = 115.04/x
  3. Step 3: Cross multiply
    156.40x = 216.04 × 115.04
  4. Step 4: Simplify right side
    156.40x = 24,853.24
  5. Step 5: Solve for x
    x = 24,853.24/156.40
  6. Step 6: Final answer
    x = 158.91

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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.