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Finding the Fourth Proportional to 587.77, 811.40 and 378.25

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Solution

The fourth proportional to 587.77, 811.40 and 378.25 is: 522.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.77 : 811.40 = 378.25 : x
  2. Step 2: Convert to fraction form
    587.77/811.40 = 378.25/x
  3. Step 3: Cross multiply
    587.77x = 811.40 × 378.25
  4. Step 4: Simplify right side
    587.77x = 306,912.05
  5. Step 5: Solve for x
    x = 306,912.05/587.77
  6. Step 6: Final answer
    x = 522.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.