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Finding the Fourth Proportional to 287.03, 396.11 and 156.04

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Solution

The fourth proportional to 287.03, 396.11 and 156.04 is: 215.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.03 : 396.11 = 156.04 : x
  2. Step 2: Convert to fraction form
    287.03/396.11 = 156.04/x
  3. Step 3: Cross multiply
    287.03x = 396.11 × 156.04
  4. Step 4: Simplify right side
    287.03x = 61,808.22
  5. Step 5: Solve for x
    x = 61,808.22/287.03
  6. Step 6: Final answer
    x = 215.34

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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.