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Finding the Fourth Proportional to 156.18, 215.10 and 144.65

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Solution

The fourth proportional to 156.18, 215.10 and 144.65 is: 199.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.18 : 215.10 = 144.65 : x
  2. Step 2: Convert to fraction form
    156.18/215.10 = 144.65/x
  3. Step 3: Cross multiply
    156.18x = 215.10 × 144.65
  4. Step 4: Simplify right side
    156.18x = 31,113.14
  5. Step 5: Solve for x
    x = 31,113.14/156.18
  6. Step 6: Final answer
    x = 199.21

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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.