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Finding the Fourth Proportional to 287.60, 430.68 and 222.80

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Solution

The fourth proportional to 287.60, 430.68 and 222.80 is: 333.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.60 : 430.68 = 222.80 : x
  2. Step 2: Convert to fraction form
    287.60/430.68 = 222.80/x
  3. Step 3: Cross multiply
    287.60x = 430.68 × 222.80
  4. Step 4: Simplify right side
    287.60x = 95,955.50
  5. Step 5: Solve for x
    x = 95,955.50/287.60
  6. Step 6: Final answer
    x = 333.64

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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.