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Finding the Fourth Proportional to 156.05, 215.32 and 89.65

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Solution

The fourth proportional to 156.05, 215.32 and 89.65 is: 123.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.05 : 215.32 = 89.65 : x
  2. Step 2: Convert to fraction form
    156.05/215.32 = 89.65/x
  3. Step 3: Cross multiply
    156.05x = 215.32 × 89.65
  4. Step 4: Simplify right side
    156.05x = 19,303.44
  5. Step 5: Solve for x
    x = 19,303.44/156.05
  6. Step 6: Final answer
    x = 123.70

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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.