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Finding the Fourth Proportional to 288.48, 431.66 and 173.00

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Solution

The fourth proportional to 288.48, 431.66 and 173.00 is: 258.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.48 : 431.66 = 173.00 : x
  2. Step 2: Convert to fraction form
    288.48/431.66 = 173.00/x
  3. Step 3: Cross multiply
    288.48x = 431.66 × 173.00
  4. Step 4: Simplify right side
    288.48x = 74,674.16
  5. Step 5: Solve for x
    x = 74,674.16/288.48
  6. Step 6: Final answer
    x = 258.85

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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.