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Finding the Fourth Proportional to 156.94, 235.51 and 139.12

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Solution

The fourth proportional to 156.94, 235.51 and 139.12 is: 208.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.94 : 235.51 = 139.12 : x
  2. Step 2: Convert to fraction form
    156.94/235.51 = 139.12/x
  3. Step 3: Cross multiply
    156.94x = 235.51 × 139.12
  4. Step 4: Simplify right side
    156.94x = 32,763.21
  5. Step 5: Solve for x
    x = 32,763.21/156.94
  6. Step 6: Final answer
    x = 208.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.