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Finding the Fourth Proportional to 580.87, 801.60 and 318.90

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Solution

The fourth proportional to 580.87, 801.60 and 318.90 is: 440.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.87 : 801.60 = 318.90 : x
  2. Step 2: Convert to fraction form
    580.87/801.60 = 318.90/x
  3. Step 3: Cross multiply
    580.87x = 801.60 × 318.90
  4. Step 4: Simplify right side
    580.87x = 255,630.24
  5. Step 5: Solve for x
    x = 255,630.24/580.87
  6. Step 6: Final answer
    x = 440.08

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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.