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Finding the Fourth Proportional to 876.12, 1,314.36 and 388.92

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Solution

The fourth proportional to 876.12, 1,314.36 and 388.92 is: 583.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.12 : 1,314.36 = 388.92 : x
  2. Step 2: Convert to fraction form
    876.12/1,314.36 = 388.92/x
  3. Step 3: Cross multiply
    876.12x = 1,314.36 × 388.92
  4. Step 4: Simplify right side
    876.12x = 511,180.89
  5. Step 5: Solve for x
    x = 511,180.89/876.12
  6. Step 6: Final answer
    x = 583.46

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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.