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Finding the Fourth Proportional to 156.25, 235.45 and 139.68

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Solution

The fourth proportional to 156.25, 235.45 and 139.68 is: 210.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.25 : 235.45 = 139.68 : x
  2. Step 2: Convert to fraction form
    156.25/235.45 = 139.68/x
  3. Step 3: Cross multiply
    156.25x = 235.45 × 139.68
  4. Step 4: Simplify right side
    156.25x = 32,887.66
  5. Step 5: Solve for x
    x = 32,887.66/156.25
  6. Step 6: Final answer
    x = 210.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.