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Finding the Fourth Proportional to 715.12, 1,072.80 and 228.20

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Solution

The fourth proportional to 715.12, 1,072.80 and 228.20 is: 342.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.12 : 1,072.80 = 228.20 : x
  2. Step 2: Convert to fraction form
    715.12/1,072.80 = 228.20/x
  3. Step 3: Cross multiply
    715.12x = 1,072.80 × 228.20
  4. Step 4: Simplify right side
    715.12x = 244,812.96
  5. Step 5: Solve for x
    x = 244,812.96/715.12
  6. Step 6: Final answer
    x = 342.34

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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.