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Finding the Fourth Proportional to 288.57, 432.36 and 172.74

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Solution

The fourth proportional to 288.57, 432.36 and 172.74 is: 258.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.57 : 432.36 = 172.74 : x
  2. Step 2: Convert to fraction form
    288.57/432.36 = 172.74/x
  3. Step 3: Cross multiply
    288.57x = 432.36 × 172.74
  4. Step 4: Simplify right side
    288.57x = 74,685.87
  5. Step 5: Solve for x
    x = 74,685.87/288.57
  6. Step 6: Final answer
    x = 258.81

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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.