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Finding the Fourth Proportional to 287.51, 396.65 and 187.90

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Solution

The fourth proportional to 287.51, 396.65 and 187.90 is: 259.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.51 : 396.65 = 187.90 : x
  2. Step 2: Convert to fraction form
    287.51/396.65 = 187.90/x
  3. Step 3: Cross multiply
    287.51x = 396.65 × 187.90
  4. Step 4: Simplify right side
    287.51x = 74,530.01
  5. Step 5: Solve for x
    x = 74,530.01/287.51
  6. Step 6: Final answer
    x = 259.22

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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.