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Finding the Fourth Proportional to 896.81, 1,345.11 and 312.12

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Solution

The fourth proportional to 896.81, 1,345.11 and 312.12 is: 468.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.81 : 1,345.11 = 312.12 : x
  2. Step 2: Convert to fraction form
    896.81/1,345.11 = 312.12/x
  3. Step 3: Cross multiply
    896.81x = 1,345.11 × 312.12
  4. Step 4: Simplify right side
    896.81x = 419,834.56
  5. Step 5: Solve for x
    x = 419,834.56/896.81
  6. Step 6: Final answer
    x = 468.14

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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.