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Finding the Fourth Proportional to 287.77, 431.65 and 71.35

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Solution

The fourth proportional to 287.77, 431.65 and 71.35 is: 107.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.77 : 431.65 = 71.35 : x
  2. Step 2: Convert to fraction form
    287.77/431.65 = 71.35/x
  3. Step 3: Cross multiply
    287.77x = 431.65 × 71.35
  4. Step 4: Simplify right side
    287.77x = 30,796.97
  5. Step 5: Solve for x
    x = 30,796.97/287.77
  6. Step 6: Final answer
    x = 107.02

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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.