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Finding the Fourth Proportional to 580.29, 800.78 and 318.30

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Solution

The fourth proportional to 580.29, 800.78 and 318.30 is: 439.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.29 : 800.78 = 318.30 : x
  2. Step 2: Convert to fraction form
    580.29/800.78 = 318.30/x
  3. Step 3: Cross multiply
    580.29x = 800.78 × 318.30
  4. Step 4: Simplify right side
    580.29x = 254,888.27
  5. Step 5: Solve for x
    x = 254,888.27/580.29
  6. Step 6: Final answer
    x = 439.24

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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.