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Finding the Fourth Proportional to 287.56, 431.35 and 95.20

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Solution

The fourth proportional to 287.56, 431.35 and 95.20 is: 142.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.56 : 431.35 = 95.20 : x
  2. Step 2: Convert to fraction form
    287.56/431.35 = 95.20/x
  3. Step 3: Cross multiply
    287.56x = 431.35 × 95.20
  4. Step 4: Simplify right side
    287.56x = 41,062.36
  5. Step 5: Solve for x
    x = 41,062.36/287.56
  6. Step 6: Final answer
    x = 142.80

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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.