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Finding the Fourth Proportional to 287.49, 396.74 and 156.50

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Solution

The fourth proportional to 287.49, 396.74 and 156.50 is: 215.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.49 : 396.74 = 156.50 : x
  2. Step 2: Convert to fraction form
    287.49/396.74 = 156.50/x
  3. Step 3: Cross multiply
    287.49x = 396.74 × 156.50
  4. Step 4: Simplify right side
    287.49x = 62,090.02
  5. Step 5: Solve for x
    x = 62,090.02/287.49
  6. Step 6: Final answer
    x = 215.97

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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.