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Finding the Fourth Proportional to 287.61, 431.48 and 105.02

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Solution

The fourth proportional to 287.61, 431.48 and 105.02 is: 157.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.61 : 431.48 = 105.02 : x
  2. Step 2: Convert to fraction form
    287.61/431.48 = 105.02/x
  3. Step 3: Cross multiply
    287.61x = 431.48 × 105.02
  4. Step 4: Simplify right side
    287.61x = 45,314.38
  5. Step 5: Solve for x
    x = 45,314.38/287.61
  6. Step 6: Final answer
    x = 157.55

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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.