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Finding the Fourth Proportional to 1,285.67, 1,928.51 and 311.77

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Solution

The fourth proportional to 1,285.67, 1,928.51 and 311.77 is: 467.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.67 : 1,928.51 = 311.77 : x
  2. Step 2: Convert to fraction form
    1,285.67/1,928.51 = 311.77/x
  3. Step 3: Cross multiply
    1,285.67x = 1,928.51 × 311.77
  4. Step 4: Simplify right side
    1,285.67x = 601,242.74
  5. Step 5: Solve for x
    x = 601,242.74/1,285.67
  6. Step 6: Final answer
    x = 467.65

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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.