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Finding the Fourth Proportional to 715.12, 1,072.68 and 202.12

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Solution

The fourth proportional to 715.12, 1,072.68 and 202.12 is: 303.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.12 : 1,072.68 = 202.12 : x
  2. Step 2: Convert to fraction form
    715.12/1,072.68 = 202.12/x
  3. Step 3: Cross multiply
    715.12x = 1,072.68 × 202.12
  4. Step 4: Simplify right side
    715.12x = 216,810.08
  5. Step 5: Solve for x
    x = 216,810.08/715.12
  6. Step 6: Final answer
    x = 303.18

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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.