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Finding the Fourth Proportional to 874.87, 1,312.76 and 388.27

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Solution

The fourth proportional to 874.87, 1,312.76 and 388.27 is: 582.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.87 : 1,312.76 = 388.27 : x
  2. Step 2: Convert to fraction form
    874.87/1,312.76 = 388.27/x
  3. Step 3: Cross multiply
    874.87x = 1,312.76 × 388.27
  4. Step 4: Simplify right side
    874.87x = 509,696.82
  5. Step 5: Solve for x
    x = 509,696.82/874.87
  6. Step 6: Final answer
    x = 582.60

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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.