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Finding the Fourth Proportional to 813.76, 1,218.20 and 488.14

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Solution

The fourth proportional to 813.76, 1,218.20 and 488.14 is: 730.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.76 : 1,218.20 = 488.14 : x
  2. Step 2: Convert to fraction form
    813.76/1,218.20 = 488.14/x
  3. Step 3: Cross multiply
    813.76x = 1,218.20 × 488.14
  4. Step 4: Simplify right side
    813.76x = 594,652.15
  5. Step 5: Solve for x
    x = 594,652.15/813.76
  6. Step 6: Final answer
    x = 730.75

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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.