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Finding the Fourth Proportional to 287.88, 431.73 and 114.45

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Solution

The fourth proportional to 287.88, 431.73 and 114.45 is: 171.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.88 : 431.73 = 114.45 : x
  2. Step 2: Convert to fraction form
    287.88/431.73 = 114.45/x
  3. Step 3: Cross multiply
    287.88x = 431.73 × 114.45
  4. Step 4: Simplify right side
    287.88x = 49,411.50
  5. Step 5: Solve for x
    x = 49,411.50/287.88
  6. Step 6: Final answer
    x = 171.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.