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Finding the Fourth Proportional to 874.87, 1,312.94 and 387.79

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Solution

The fourth proportional to 874.87, 1,312.94 and 387.79 is: 581.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.87 : 1,312.94 = 387.79 : x
  2. Step 2: Convert to fraction form
    874.87/1,312.94 = 387.79/x
  3. Step 3: Cross multiply
    874.87x = 1,312.94 × 387.79
  4. Step 4: Simplify right side
    874.87x = 509,142.69
  5. Step 5: Solve for x
    x = 509,142.69/874.87
  6. Step 6: Final answer
    x = 581.97

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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.