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Finding the Fourth Proportional to 287.24, 430.80 and 172.49

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Solution

The fourth proportional to 287.24, 430.80 and 172.49 is: 258.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.24 : 430.80 = 172.49 : x
  2. Step 2: Convert to fraction form
    287.24/430.80 = 172.49/x
  3. Step 3: Cross multiply
    287.24x = 430.80 × 172.49
  4. Step 4: Simplify right side
    287.24x = 74,306.54
  5. Step 5: Solve for x
    x = 74,306.54/287.24
  6. Step 6: Final answer
    x = 258.70

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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.