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Finding the Fourth Proportional to 580.74, 801.40 and 318.74

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Solution

The fourth proportional to 580.74, 801.40 and 318.74 is: 439.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.74 : 801.40 = 318.74 : x
  2. Step 2: Convert to fraction form
    580.74/801.40 = 318.74/x
  3. Step 3: Cross multiply
    580.74x = 801.40 × 318.74
  4. Step 4: Simplify right side
    580.74x = 255,438.24
  5. Step 5: Solve for x
    x = 255,438.24/580.74
  6. Step 6: Final answer
    x = 439.85

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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.