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Finding the Fourth Proportional to 156.06, 215.45 and 100.88

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Solution

The fourth proportional to 156.06, 215.45 and 100.88 is: 139.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.06 : 215.45 = 100.88 : x
  2. Step 2: Convert to fraction form
    156.06/215.45 = 100.88/x
  3. Step 3: Cross multiply
    156.06x = 215.45 × 100.88
  4. Step 4: Simplify right side
    156.06x = 21,733.01
  5. Step 5: Solve for x
    x = 21,733.01/156.06
  6. Step 6: Final answer
    x = 139.27

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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.