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Finding the Fourth Proportional to 156.11, 215.36 and 90.60

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Solution

The fourth proportional to 156.11, 215.36 and 90.60 is: 124.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.11 : 215.36 = 90.60 : x
  2. Step 2: Convert to fraction form
    156.11/215.36 = 90.60/x
  3. Step 3: Cross multiply
    156.11x = 215.36 × 90.60
  4. Step 4: Simplify right side
    156.11x = 19,511.16
  5. Step 5: Solve for x
    x = 19,511.16/156.11
  6. Step 6: Final answer
    x = 124.99

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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.