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Finding the Fourth Proportional to 813.83, 1,220.71 and 652.55

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Solution

The fourth proportional to 813.83, 1,220.71 and 652.55 is: 978.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.83 : 1,220.71 = 652.55 : x
  2. Step 2: Convert to fraction form
    813.83/1,220.71 = 652.55/x
  3. Step 3: Cross multiply
    813.83x = 1,220.71 × 652.55
  4. Step 4: Simplify right side
    813.83x = 796,564.94
  5. Step 5: Solve for x
    x = 796,564.94/813.83
  6. Step 6: Final answer
    x = 978.79

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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.