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Finding the Fourth Proportional to 156.29, 215.83 and 125.40

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Solution

The fourth proportional to 156.29, 215.83 and 125.40 is: 173.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.29 : 215.83 = 125.40 : x
  2. Step 2: Convert to fraction form
    156.29/215.83 = 125.40/x
  3. Step 3: Cross multiply
    156.29x = 215.83 × 125.40
  4. Step 4: Simplify right side
    156.29x = 27,066.05
  5. Step 5: Solve for x
    x = 27,066.05/156.29
  6. Step 6: Final answer
    x = 173.18

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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.