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Finding the Fourth Proportional to 156.16, 215.21 and 121.13

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Solution

The fourth proportional to 156.16, 215.21 and 121.13 is: 166.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.16 : 215.21 = 121.13 : x
  2. Step 2: Convert to fraction form
    156.16/215.21 = 121.13/x
  3. Step 3: Cross multiply
    156.16x = 215.21 × 121.13
  4. Step 4: Simplify right side
    156.16x = 26,066.71
  5. Step 5: Solve for x
    x = 26,066.71/156.16
  6. Step 6: Final answer
    x = 166.93

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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.