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Finding the Fourth Proportional to 156.72, 216.08 and 133.40

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Solution

The fourth proportional to 156.72, 216.08 and 133.40 is: 183.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.72 : 216.08 = 133.40 : x
  2. Step 2: Convert to fraction form
    156.72/216.08 = 133.40/x
  3. Step 3: Cross multiply
    156.72x = 216.08 × 133.40
  4. Step 4: Simplify right side
    156.72x = 28,825.07
  5. Step 5: Solve for x
    x = 28,825.07/156.72
  6. Step 6: Final answer
    x = 183.93

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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.