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Finding the Fourth Proportional to 580.37, 870.40 and 255.66

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Solution

The fourth proportional to 580.37, 870.40 and 255.66 is: 383.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.37 : 870.40 = 255.66 : x
  2. Step 2: Convert to fraction form
    580.37/870.40 = 255.66/x
  3. Step 3: Cross multiply
    580.37x = 870.40 × 255.66
  4. Step 4: Simplify right side
    580.37x = 222,522.08
  5. Step 5: Solve for x
    x = 222,522.08/580.37
  6. Step 6: Final answer
    x = 383.42

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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.