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Finding the Fourth Proportional to 1,011.12, 1,516.74 and 317.81

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Solution

The fourth proportional to 1,011.12, 1,516.74 and 317.81 is: 476.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.12 : 1,516.74 = 317.81 : x
  2. Step 2: Convert to fraction form
    1,011.12/1,516.74 = 317.81/x
  3. Step 3: Cross multiply
    1,011.12x = 1,516.74 × 317.81
  4. Step 4: Simplify right side
    1,011.12x = 482,033.55
  5. Step 5: Solve for x
    x = 482,033.55/1,011.12
  6. Step 6: Final answer
    x = 476.73

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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.