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Finding the Fourth Proportional to 580.60, 801.20 and 318.64

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Solution

The fourth proportional to 580.60, 801.20 and 318.64 is: 439.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.60 : 801.20 = 318.64 : x
  2. Step 2: Convert to fraction form
    580.60/801.20 = 318.64/x
  3. Step 3: Cross multiply
    580.60x = 801.20 × 318.64
  4. Step 4: Simplify right side
    580.60x = 255,294.37
  5. Step 5: Solve for x
    x = 255,294.37/580.60
  6. Step 6: Final answer
    x = 439.71

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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.