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Finding the Fourth Proportional to 156.60, 216 and 128.93

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Solution

The fourth proportional to 156.60, 216 and 128.93 is: 177.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.60 : 216 = 128.93 : x
  2. Step 2: Convert to fraction form
    156.60/216 = 128.93/x
  3. Step 3: Cross multiply
    156.60x = 216 × 128.93
  4. Step 4: Simplify right side
    156.60x = 27,847.80
  5. Step 5: Solve for x
    x = 27,847.80/156.60
  6. Step 6: Final answer
    x = 177.83

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1.5x scale

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.