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Finding the Fourth Proportional to 287.40, 431.08 and 95.02

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Solution

The fourth proportional to 287.40, 431.08 and 95.02 is: 142.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.40 : 431.08 = 95.02 : x
  2. Step 2: Convert to fraction form
    287.40/431.08 = 95.02/x
  3. Step 3: Cross multiply
    287.40x = 431.08 × 95.02
  4. Step 4: Simplify right side
    287.40x = 40,961.22
  5. Step 5: Solve for x
    x = 40,961.22/287.40
  6. Step 6: Final answer
    x = 142.52

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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.