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Finding the Fourth Proportional to 287.60, 431.03 and 143.36

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Solution

The fourth proportional to 287.60, 431.03 and 143.36 is: 214.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.60 : 431.03 = 143.36 : x
  2. Step 2: Convert to fraction form
    287.60/431.03 = 143.36/x
  3. Step 3: Cross multiply
    287.60x = 431.03 × 143.36
  4. Step 4: Simplify right side
    287.60x = 61,790.66
  5. Step 5: Solve for x
    x = 61,790.66/287.60
  6. Step 6: Final answer
    x = 214.85

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