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Finding the Fourth Proportional to 156.19, 215.55 and 89.81

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Solution

The fourth proportional to 156.19, 215.55 and 89.81 is: 123.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.19 : 215.55 = 89.81 : x
  2. Step 2: Convert to fraction form
    156.19/215.55 = 89.81/x
  3. Step 3: Cross multiply
    156.19x = 215.55 × 89.81
  4. Step 4: Simplify right side
    156.19x = 19,359.30
  5. Step 5: Solve for x
    x = 19,359.30/156.19
  6. Step 6: Final answer
    x = 123.94

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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.